When I began this work, seven years ago, I was strongly inclined to believe that the lateral-secretion theory afforded the most reasonable explanation of the origin of auriferous deposits in these colonies; but, as the result of each series of examinations appeared, I was forced to the following conclusions:
If any reliance can be placed on the examinations detailed in the foregoing chapters, they seem to indicate that the gold of many lodes of the chief mining districts of New Zealand, Victoria and Queensland is due not to lateral segregation from the adjacent country-rock, but to solutions ascending from some rock deeper than any now exposed at the surface in any part of these colonies.
I am not concerned with the question whether this source is the vague "barysphere," with its somewhat apocryphal contents of heavy metals. I have simply to note that a series of laborious and careful examinations has failed to find it in the rocks of the "lithosphere."
What may be the value of these investigations in the study of the general question of the origin of ore-deposits I leave the reader to judge, being myself content to quote the opinion of Prof. Stelzner, of Freiberg, no mean investigator of that larger question, that
Table I.—Analyses of Country-Rock from Deep Levels. New Chum Railway G. M. Co., Bendigo, Victoria.
Sample. |
Distance from Shaft. |
Distance from Reef. |
Weight Examined. |
Weight of Concentrates Obtained. |
Weight of Concentrates of Specific Gravity above 3.18. |
Percentage of Sulphur. |
Percentage of Carbon. |
Weight of Gold Obtained. |
Yield of Gold per Ton of Country-Rock. |
|
Feet. |
Feet. |
Lbs. |
Grains. |
Grains. |
|
|
Grains. |
Grains. |
a. Fine-grained sandstone. No sulphides visible with a hand-lens. Concentrates contained a very small quantity of sulphides. |
At shaft. |
277 |
4.48 |
240 |
76 |
0.06 |
|
Nil. |
Nil. |
b. Fine-grained sandy slate. Pyrite in minute cubes, very sparingly distributed throughout the sample. Concentrates contained a small quantity of sulfides. |
16 |
261 |
4.48 |
364 |
42 |
0.04 |
0.68 |
Nil. |
Nil. |
c. Sandstone somewhat coarsegrained. No sulphides visible. Concentrates contained only a trace of sulphides. |
37 |
240 |
4.48 |
180 |
61 |
0.09 |
|
Nil. |
Nil. |
d. Fine-grained, comparatively soft, dark-blue slate, from the vicinity of a small slide, showing pyrite and blende sparingly with a hand-lens. Concentrates showed pure pyrite and blende. |
59 |
218 |
4.48 |
424 |
265 |
0.57 |
1.46 |
.0017 |
0.85 |
e. Very hard, fine-grained sandstone. Pyrite in large cubes visible in the sample. Concentrates contained a good percentage of pyrite. |
84 |
193 |
4.48 |
356 |
112 |
0.24 |
|
Nil. |
Nil. |
f. Very hard, fine-grained light blue slate; very distinct cleavage; no trace of sulphides. Concentrates contained a trace of sulphides. |
103 |
174 |
4.48 |
180 |
27 |
Trace. |
0.06 |
Nil. |
Nil. |
g. Rather coarse grained sandstone, with cubes of pyrite, in one case 15 mm. in diameter. Concentrates nearly all pyrite. |
127 |
150 |
4.48 |
456 |
312 |
0.63 |
|
Nil. |
Nil. |
h. Soft-grained dark blue slate, with a small quantity of pyrite and blende visible with a hand-lens. Concentrates showed a good quantity of pyrite and blende. |
145 |
132 |
4.48 |
630 |
418 |
0.86 |
1.32 |
Gold button lost. |
|
h′. Same as above. |
145 |
132 |
2.24 |
250 |
197 |
0.86 |
1.32 |
.0004 |
0.4 |
i. Very hard, fine-grained sandstone. No sulphides visible. Concentrates contained no sulphides. |
167 |
110 |
4.48 |
164 |
26 |
Trace. |
|
Nil. |
Nil. |
j. Same as i. |
179 |
98 |
4.48 |
212 |
38 |
Trace. |
|
Nil. |
Nil. |
k. Same as i. |
191 |
86 |
4.48 |
185 |
38 |
Trace. |
|
Nil. |
Nil. |
l. Fine-grained slate from both sides of a "slide," or slight fault, showing pyrite in small quantity. The sample included a little "pug" from the slide. Concentrates nearly all pyrite. |
192 |
85 |
4.48 |
378 |
216 |
0.54 |
Nil. |
.0016 |
0.8 |
m. Fine-grained slate from both sides of a "slide," or slight fault, showing pyrite in small quantity. The sample included a little "pug" from the slide. Concentrates contained a good percentage of pyrite and blende, with a little galena. In the case of samples marked * the whole of the sample left after concentration was assayed after the concentrates had been examined. |
192 |
85 |
4.48 |
643 |
498 |
1.03 |
Nil. |
.0023 |
1.15page 60 |
n. Fine-grained sandstone with pyrite in large crystals and a little blende. |
214 |
63 |
4.48 |
387 |
266 |
0.58 |
|
.0027 |
1.35 |
o. Dark-blue carbonaceous slate with pyrite, arsenopy rite and blende in fair quantity. Concentrates mostly pyrite and blende. |
230 |
47 |
4.48 |
678 |
429 |
0.90 |
0.56 |
.0017 |
.85 |
p. Same as o. |
250 |
27 |
4.48 |
547 |
392 |
1.02 |
0.68 |
.0034 |
1.7 |
q. Same as o. |
265 |
12 |
4.48 |
1140 |
674 |
1.66 |
0.89 |
.0043 |
2.15 |
r*. Fine-grained sandstone. No sulphides visible. Concentrates contained only a trace of sulphides. |
271 |
6 |
4.48 |
146 |
32 |
Traces |
|
Nil. |
Nil. |
s. Hard, dark-blue carbonaceous slate, showing pyrite freely, with a little blende. Concentrates obtained nearly clean sulphides. |
274 |
3 |
4.48 |
1246 |
827 |
1.98 |
2.64 |
.0065 |
3.25 |
t. Dark-colored casing-slate of the lode (almost black in color from carbonaceous matter), showing a large quantity of pyrite, with a little blende and galena. Concentrates nearly clean sulphides. |
276 |
1 |
4.48 |
1627 |
1016 |
2.10 |
4.50 |
.0132 |
6.6 |
u. Same as t. |
276 |
1 |
4.48 |
1518 |
1142 |
1.87 |
6.34 |
.0089 |
4.45 |
V
w
x Laminated quartz (laminæ due to carbonaceous matter from the walls), showing pyrite, blende and galena. Not concentrated. In the case of samples marked * the whole of the sample left after concentration was assayed after the concentrates had been examined. |
277 |
From the Reef |
3.50 |
|
|
3.43 |
2.16 |
oz. dwt. gt. 2 16 5 1 0 11 1 15 13 |
Table V.—Analyses of Country-Rock from. Deep Levels, Northern Star G. M. Co., Ballarat West.
Sample. |
Distance from Shaft. |
Distance from Reef. |
Weight Examined. |
Weight of Concentrates. |
Weight of Concentrates of Specific Gravity over 3.18. |
Percentage of Sulphur. |
Yield of Gold. |
Yield of Gold per Ton of Country-Rock. |
|
Feet. |
Feet. |
Pounds. |
Grains |
Grains. |
|
Grains. |
Grains. |
a. Hard, fine-grained sandstone with vein of white quartz ½-inch wide. No sulphides visible. |
0 |
100 |
4.48 |
253 |
48 |
0.002 |
Nil. |
Nil. |
b. The same, but with a small quantity of pyrites in large cubes. Concentrates contained a good percentage of pyrite. |
37 |
63 |
4.48 |
416 |
50 |
0.017 |
.0002 |
0.1 |
c. Fine-grained blue slate, showing a little pyrite. Concentrates contained a little galena. |
81 |
19 |
4.48 |
378 |
89 |
0.035 |
.0004 |
.2 |
d. Hard, grayish-blue sandstone. No pyrites visible. |
92 |
8 |
4.48 |
210 |
23 |
Nil. |
Nil. |
Nil. |
e. Carbonaceous slate with small quartz-veins, forming the casing. Concentrates nearly all sulphides. |
99 |
1 |
4.48 |
1217 |
876 |
1.46 |
.0071 |
3.55 |
f. White, splintery quartz from the "Guiding Star" lode, with laminae of carbonaceous shale, showing a little pyrite and arsenopyrite All analyzed. |
100 |
"Guiding Star" lode. |
1000 grs. |
|
|
2.8 |
|
314. |
g. Fine-grained black slate from the wall of the "Guiding Star" lode. Showed a very little pyrite and arsenopyrite. Concentrates mostly sulphides. |
104 |
0 |
4.48 |
586 |
347 |
.37 |
.0036 |
7.2 |
h. Hard sandstone with no sulphides. |
131 |
27 |
4.48 |
216 |
49 |
Trace. |
Nil. |
Nil. |
i. The same. |
174 |
70 |
4.48 |
315 |
42 |
Trace. |
Nil. |
Nil. |
j. Slate from beside a small quartz-vein 2 inches wide. Showed a little pyrite. Concentrates contained fair proportion of pyrite. |
216 |
112 |
4.43 |
842 |
194 |
.37 |
Nil. |
Nil. |
k. White quartz from leader 2 inches wide. No sulphides visible. All analyzed. |
216 |
112 |
1000 grs. |
|
|
Trace. |
Nil. |
Nil. |
l. Sandstone with large cubes of pyrite from hanging-wall of a vein of quartz about 6 inches wide. Concentrates contained a large percentage of sulphides. |
278 |
174 |
4.48 |
624 |
416 |
.62 |
Nil. |
Nil. |
m. Sandstone, hard, moderately coarse-grained. No sulphides. |
336 |
232 |
4.48 |
317 |
46 |
.02 |
Nil. |
Nil. |
n. Slate, with pyrite and arsenopyrite visible in small quantities, taken from the wall of a slide which was filled with recently-formed limonite. Concentrates showed a good percentage of sulphides. In the case of samples marked * the whole of the sample left after concentration was assayed after the concentrates had been examined. |
399 |
295 |
4.48 |
426 |
240 |
.41 |
.0013 |
0.65page 66 |
o. Solid, hard sandstone. No pyrite visible. Concentrates not analyzed. |
440 |
336 |
4.48 |
|
|
|
|
|
p. Slate from below a small flat quartz-vein 2 inches wide. Showed a little sulphide. Concentrates contained a good percentage of pyrite. |
499 |
395 |
4.48 |
435 |
193 |
0.32 |
.0027 |
1.35 |
q. Quartz from a small flat vein, showing a little pyrite. |
499 |
395 |
1000 grs. |
|
|
0.68 |
.0016 |
25. |
r. Slaty sandstone, showing large crystals of pyrite. Concentrates nearly pure pyrite. |
550 |
446 |
4.48 |
1216 |
800 |
1.06 |
Nil. |
Nil. |
s. Slate, with no sign of pyrite, from near a small quartz-vein, varying from inches to 1 inch in width. |
617 |
513 |
4.48 |
316 |
74 |
Trace. |
Nil. |
Nil. |
t. Slate very close to a fault or "slide," showing pyrite and blende. Concentrates contained a large percentage of sulphides. |
678 |
574 |
4.48 |
743 |
495 |
0.79 |
.0071 |
3.55 |
u. Hard, fine-grained sandstone, showing no sulphides. Concentrates as analyzed. |
741 |
637 |
|
|
|
|
|
|
v. Same as above. |
804 |
700 |
4.48 |
216 |
39 |
Nil. |
Lost. |
Lost. |
w. Fine-grained slate, showing no trace of sulphides. |
859 |
755 |
4.48 |
349 |
72 |
Nil. |
Nil. |
Nil. |
x. Hard, fine sandstone. No pyrite. Concentrates not analyzed. |
908 |
813 |
|
|
|
|
|
|
y. Sandstone from the foot-wall of a lode 1 foot wide, running parallel with the "Guiding Star." Showed pyrite in large crystals. Concentrates contained good proportion of pyrite. |
971 |
867 |
4.48 |
614 |
394 |
0.73 |
Nil. |
Nil. |
z. Slaty sandstone, with crystals of pyrite and a small proportion of arsene-pyrite. Concentrates nearly all sulphides. |
1017 |
903 |
4.48 |
1026 |
859 |
1.37 |
.0015 |
0.75 |
A. Sandstone, with large crystals of pyrite. Concentrates nearly all pyrite. |
1051 |
947 |
4.48 |
694 |
512 |
0.78 |
Nil. |
Nil. |
B. Slate from the wall of an eruptive dike of felsite porphyry. Large crystah of pyrite were abundant in the sample, and blende and galena sparingly distributed In the case of samples marked * the whole of the sample left after concentration was assayed after the concentrates had been examined. |
1066 |
956 |
4.48 |
1846 |
1327 |
2.35 |
.008 |
0.4page 67 |
Dike 1. Sample taken from 4 feet in the dike. Contained large quantity of pyrite in large crystals, with inclusions of slate and sandstone. Concentrates nearly all sulphides. |
1068 |
964 |
4.48 |
2143 |
1827 |
3.69 |
.0134 |
6.7 |
Dike 2. The same, with much less pyrite. Concentrates nearly all sulphides. |
1073 |
969 |
4.48 |
946 |
743 |
0.96 |
.0076 |
3.8 |
Dike 3. The same. No sulphides visible, and no inclusions of slate and sandstone. |
1082 |
978 |
4.48 |
176 |
34 |
Trace. |
Nil. |
Nil. |
Dike 4. Dike 1 foot from farther wall, included many fragments of slate and sandstone from the country-rock. Contained pyrite in large quantities, with a little arseno-pyrite and blende. |
1095 |
991 |
4.48 |
1875 |
1642 |
3.24 |
.014 |
0.2 |
C. Sandstone from the farther wall of dike, containing large crystals of pyrite. Concentrates mostly pyrite. |
1097 |
993 |
4.48 |
1163 |
901 |
1.73 |
.006 |
0.3 |
D. Sandstone from the vicinity of a "slide" No pyrite visible. |
1150 |
1046 |
4.48 |
314 |
86 |
0.18 |
Lost. |
Lost. |
E. Slate from the wall of a small quartz-vein, 6 inches wide. Showed a fair quantity of pyrite with a little galena. Concentrates nearly all sulphides. |
1207 |
1103 |
4.48 |
946 |
713 |
1.02 |
.0075 |
3.75 |
F. Sandstone, with large crystals of pyrite. Concentrates mostly pyrite. |
1221 |
1117 |
4.48 |
673 |
442 |
0.72 |
.014 |
7. |
G. Slate, with a little pyrite and blende, from the farthest point of the workings. |
1242 |
1138 |
4.48 |
476 |
319 |
0.54 |
.0035 |
1.75 |
Table XIII.—Analyses of Samples of Country-Rock from the Deep Circulation of the Tipperary G. M. Co., Macetown (Low Level Tunnel).
Sample. |
Distance from Gold-Bearing Reef. |
Weight Analyzed. |
Weight of Concentrates. |
Weight of Concentrates Having Specific Gravity over 3.18. |
Sulphur as Insoluble Sulphides. |
Yield of Gold. |
Yield of Gold per Ton of Rock. |
|
From Dublin United Reef. |
|
|
|
|
|
|
|
Feet. |
Lbs. |
Grains. |
Grains. |
Grains. |
Grains. |
Grains |
a. Mica-schist. No sulphides visible. |
16 |
4.48 |
317 With little pyrite. |
109 |
0.16 |
0.0003 |
0.15 |
b. Same as above. |
37 |
4.48 |
349 No pyrite. |
37 |
Trace. |
Nil. |
Nil. |
c. The same. Pyrite visible in small quantity in quartz-folia. |
62 |
4.48 |
427 With a fair quantity of pyrite. |
218 |
0.39 |
0.0017 |
0.85 |
d. The same. No pyrite visible. |
90 |
4.48 |
248 No sulphides. |
20 |
Nil. |
Nil. |
Nil. |
e. Same as above. |
130 |
4.48 |
173 No sulphides. |
43 |
Nil. |
Nil. |
Nil. |
f. Same as above. |
158 |
4.48 |
386 No sulphides. |
71 |
Trace. |
Lost. |
Lost. |
g. The same, from vicinity of slight fault. The sample included a small quantity of fault rock. |
198 |
4.48 |
318 No sulphides. |
59 |
Nil. |
Nil. |
Nil. |
h. The same. No sulphides visible. |
245 |
4.48 |
209 No sulphides. |
47 |
Nil. |
Nil. |
Nil. |
i. The same, from a slight fault. Sample much broken and contorted, with quartz veins in all directions, showing a little pyrite. |
273 |
4.48 |
373 A fair percentage of pyrite. |
219 |
0.36 |
Nil. |
Nil. |
j. Solid mica-schist, with a little pyrite and arsenopyrite in foliation-planes and joints. |
326 |
4.48 |
597 A good proportion of sulphides. |
373 |
0.58 |
Nil. |
Nil. |
k. Mica-schist, with a little pyrite, and arsenopyrite in foliation-planes and joints. |
405 |
4.48 |
630 Pyrite in fair proportion. |
296 |
0.30 |
Nil. |
Nil. |
l. The same, showing pyrite and arsenopyrite pretty freely in quartz-folia. |
438 |
4.48 |
375 Nearly all sulphides. |
280 |
0.41 |
Nil. |
Nil. |
|
From Killarney Reef. |
|
|
|
|
|
|
m. 940 feet from entrance of tunnel. Mica-schist. No sulphides visible. |
400 |
4.48 |
209 Very little pyrite. |
33 |
Trace. |
Lost. |
Lost. |
n. Mica-schist. No sulphides visible. |
317 |
4.48 |
173 Very little pyrite. |
49 |
Nil. |
Nil. |
Nil. |
o. Broken and contorted mica-schist from a fault-line, containing small veins of quartz, which showed pyrite and arsenopyrite in fair quantity. |
250 |
4.48 |
419 A good quantity of sulphides. |
317 |
0.59 |
0.0007 |
0.35page 78 |
|
From Killarney Reef. |
|
|
|
|
|
|
p. 740 feet from tunnel-entrance. Solid mica-schist. No sulphides visible. |
217 |
4.48 |
263 No pyrite. |
59 |
Nil. |
Nil. |
Nil. |
q. Solid mica-schist, with small quantity of pyrite, visible especially in quarts folia. |
175 |
4.48 |
290 With a little pyrite. |
111 |
0.19 |
0.0013 |
0.65 |
r. Solid mica-schist. No sulphides visible. |
143 |
4.48 |
173 No sulph'ds. |
31 |
Lost. |
Lost. |
Lost |
s. Solid mica-schist Nesulphides visible. |
110 |
4.48 |
149 No sulph'ds. |
38 |
Nil. |
Nil. |
Nil. |
t. Solid mica-schist, with pyrite in foliation-planes with mica. |
74 |
4.48 |
304 With good proportion of sulph'ds. |
209 |
0.35 |
0.0004 |
0.2 |
u. Solid mica-schist. No sulphides visible. |
39 |
4.48 |
237 |
53 |
Trace. |
Nil. |
Nil. |
v. Solid mica schist, showing no pyrite. |
18 |
4.48 |
137 With very sm'll qn'ty of sulph'ds |
48 |
0.09 |
0.0062 |
3.1 |
w. Solid mica-schist, much broken and with numerous veins of quartz and calcite, the quartz showing arsenopyrite and pyrite freely. |
Foot-wall of auriferous lode, Killarney Reef. |
4.48 |
643 Good prpt'n of sulph'ds. |
237 |
0.39 |
0.0029 |
1.45 |
x. Solid mica-schist, much broken and with numerous veins of quartz and calcite, the quartz showing arsenopyrite and pyrite freely. |
Hanging-wall of auriferous lode, Killamey Reef. |
4.48 |
509 Good prpt'n of sulphd's. |
340 |
0.58 |
0.0004 |
0.2 |
|
From Killarney Reef. |
|
|
|
|
|
|
y. Solid mica-schist. Very little pyrite. |
21 |
4.48 |
168 Very little pyrite. |
74 |
0.03 |
Nil. |
Nil |
z. Solid mica-schist, showing sulphides rather freely in foliation planes, with mica. |
49 |
4.48 |
340 With a good percentage of sulphds. |
194 |
0.37 |
0.0009 |
0.45 |
a′ Solid mica-schist. No sulphides visible. |
83 |
4.48 |
293 No sulph'ds. |
47 |
Nil. |
Nil. |
Nil. |
b′ Solid mica-schist, with small quantity of sulphides in quartz-folia. |
176 |
4.48 |
178 Small qant'y of sulphd s. |
73 |
0.011 |
0.0002 |
0.1 |
c′ Solid mica-schist. No sulphides visible. |
240 |
4.48 |
216 No sulphd's. |
29 |
Nil. |
Nil. |
Nil. |
d′ Mica-schist much broken, with veins of quartz running through sample. No sulphides visible. |
277 |
4.48 |
317 Very small quantity of sulphides. |
83 |
Trace. |
0.0005 |
0.25 |
e′ Solid mica-schist. No sulphides visible. |
300 |
4.48 |
149 No sulph'ds. |
24 |
Nil. |
Nil. |
Nil. |
f′ Solid mica-schist. |
312 |
4.48 |
145 No sulph'ds. |
43 |
Nil. |
Lost. |
Lost. |
g′ Solid mica-schist. |
326 From farther end of tunnel, 1530 feet from entrance. |
4.48 |
317 No sulph'ds. |
98 |
Nil. |
Nil. |
Nil. |
Table XIV.—Examination of Samples from the Deep Circulation of Macetown Reefs, the Samples Being Taken near the Reef
Sample. |
Distance from Auriferous Lode. |
Locality. |
Weight Examined. |
Weight of Concentrates. |
Weight of Concentrates of Specific Gravity 3.18. |
Percentage of Sulphur. |
Yield of Gold. |
Yield of Gold per Ton. |
|
Feet. |
|
Lbs. |
Grains. |
Grains. |
|
Grains. |
Grains |
a. Hanging-wall country, solid mica-schist with a little pyrite and arsenopyrite in veins. Concentrates contained a good percentage of pyrite. |
2 |
Low-level tunnel, Premier Mine, Macetown, Otago. |
4.48 |
716 |
309 |
0.65 |
0.0006 |
0.3 |
b. Hanging-wall country of a part of the lode where the lode-fissure was filled with "mullock." Sample was much broken and showed a little pyrite. |
1 |
Low-level tunnel, Premier Mine, Macetown, Otago. |
4.48 |
642 |
184 |
0.37 |
0.0003 |
0.15 |
c. Foot-wall country of a part of the lode where the lode-fissure was filled with "mullock." Solid mica schist. No sulphides visible. |
1 |
Low-level tunnel, Premier Mine, Macetown, Otago. |
4.48 |
317 |
54 |
Nil. |
Nil. |
Nil. |
d. From a cross cut in hanging-wall country; the country much broken. Sample showed no sulphides. Concentrates contained a little sulphide. |
12 |
Low-level tunnel, Premier Mine, Macetown, Otago. |
4.48 |
512 |
234 |
0.38 |
Nil. |
Nil. |
e. In the same cross cut, 24 feet further in. Solid mica schist. The specimen contained veins of quartz, with no visible pyrite. Concentrates contained a little pyrite. |
36 |
Low-level tunnel, Premier Mine, Macetown, Otago. |
4.48 |
440 |
86 |
0.06 |
Nil. |
Nil. |
f. Farther in the same cross-cut. Sample showed a little pyrite in the inter-laminations, associated with mica. |
65 |
Low-level tunnel, Premier Mine, Macetown, Otago. |
4.48 |
763 |
219 |
0.39 |
0.0002 |
0.1 |
g. In foot-wall of broken country. The sample contained much quartz, with a little pyrite and arsenopyrite. Concentrates contained a good percentage of sulphides. |
12 |
High-level adit. Premier Mine. |
4.48 |
590 |
347 |
0.58 |
0.0017 |
0.85 |
h. Twenty feet farther in, in the same cross-cut. Broken country, showing a little pyrite and arsenopyrite. Concentrates contained a good percentage of sulphides. |
32 |
High-level adit. Premier Mine. |
4.48 |
463 |
185 |
0.34 |
0.0008 |
0.4 |
i. Eight feet farther in, in the same cross-cut. Showed a considerable quantity of arsenopyrite and pyrite. |
40 |
High-level adit. Premier Mine. |
4.48 |
576 |
429 |
0.86 |
0.0075 |
3.75page 80 |
j. Over 5 feet in Movie's cross-cut. Broken country from hanging-wall side. The reef-fissure at this point contained no quartz. Sample contained a fair quantity of pyrite. |
5 |
High-level adit, Premier Mine. |
4.48 |
609 |
386 |
0.67 |
Nil. |
Nil. |
k. From the same cross-cut, 14 feet farther in. |
19 |
High-level adit, Premier Mine. |
4.48 |
375 |
193 |
0.29 |
0.0007 |
0.35 |
l. From the same cross-cut. Solid country, opposite lode-fissure filled with mullock. Showed no pyrite. |
35 |
High-level adit, Premier Mine. |
4.48 |
246 |
81 |
Nil. |
Nil. |
Nil. |
m. From the same cross-cut, 33 feet farther in; quartz-vein 2 inches wide. Showed no sulphides. |
68 |
High-level adit, Premier Mine. |
4.48 |
309 |
54 |
Nil. |
Nil. |
Nil. |
n Seven feet from the end of the same cross-cut. Broken country with numerous quartz-veins, showing sulphides freely. |
89 |
High-level adit, Premier Mine. |
4.48 |
376 |
300 |
0.52 |
0.0095 |
4.75 |
o. From the end of the same cross-cut. |
98 |
High-level adit, Premier Mine. |
4.48 |
345 |
272 |
0.45 |
0.0111 |
5.55page 81 |
p. From cross-cut No. 1. Solid country on foot-wall side; showed no pyrite. |
3 |
Tipperary high level adit. |
4.48 |
211 |
81 |
0.047 |
0.0003 |
0.15 |
q. From the same cross-cut, 33 feet farther in. Concentrates showed very little pyrite. |
36 |
Tipperary high level adit. |
4.48 |
186 |
41 |
Trace. |
Nil. |
Nil. |
r. From No. 2 cross-cut on the hanging-wall side. Lode-fissure at this part filled with "mullock." Sample from broken country, showed a good deal of pyrite and arsenopyrite. |
12 |
Tipperary high level adit. |
4.48 |
542 |
360 |
0.58 |
0.0019 |
0.95 |
s. Sample showed a good deal of quartz, with a little pyrite. |
47 |
Tipperary high level adit. |
4.48 |
396 |
184 |
0.36 |
0.0027 |
1.35 |
t. From cross-cut No. 3; hanging-wall, broken country, opposite a part where the reef-fissure lay very flat; showed no sulphides. |
1 |
Tipperary high level adit. |
4.48 |
216 |
74 |
0.019 |
0.0063 |
3.15 |
u. From the same cross-cut; country still broken; showed no sulphides. |
25 |
Tipperary high level adit. |
4.48 |
347 |
85 |
Trace. |
Nil. |
Nil. |
v. Sample taken from the end of cross-cut No. 3; showed a good proportion of sulphides. Concentrates nearly all sulphides. |
46 |
Tipperary high level adit. |
4.48 |
616 |
422 |
0.70 |
Nil. |
Nil. |
Table XV.—Analyses of Samples from the Deep Levels, Reefton Gold-Field.
Sample. |
Distance from Reef. |
Weight Examinged |
Weight of Concentrates. |
Weight of Concentates of Specific Gravity over 3.18 |
Percentage of Sulphur. |
Yield of Gold. |
Yield Gold per Ton. |
|
Feet. |
l.bs. |
Grains. |
Grains. |
Grains. |
Grains. |
Grains. |
a Soft-grained slate, much broken and showing many slickensides. The faces of the slickensides showed streaks of pyrite, due to crushing. |
From hanging-wall of auriferous reef in Progress Mine. |
4.48 |
365 With a good percentage of sulphides. |
218 |
0.06 |
0.013 |
6.5 |
b Fine-grained slate, also much broken and contorted, with a number of small quartz-veirs Showed a large quantity of pyrite. |
Foot-wall of same reef. |
4.48 |
704 Nearly all sulphides. |
593 |
0.89 |
Nil. |
Nil. |
c Fine-grained slate, showing a large quantity of arsenopyrite and pyrite with a little galena. |
16 from same reef. |
4.48 |
1248 Large percentage of sulphides. |
975 |
1.83 |
0.010 |
5. |
d and |
60 from same reef. |
4.48 |
910 |
463 |
0.71 |
0.0005 |
0.25 |
e Solid slate, little altered, showing no signs of crushing Sulphides in fair quantity. |
140 from same reef. |
4.48 |
471 Nearly all sulphides. |
309 |
0.54 |
Nil. |
Nil |
f Hard fine-grained slate, showing no sulphides. |
195 from same reef. |
4.48 |
243 No sulphides. |
65 |
Trace. |
Nil. |
Nil |
g Hard, fine-grained sandstone showing a large quantity of pyrite. |
200 from same reef. |
4.48 |
1110 Nearly all sulphides. |
873 |
1.80 |
Nil. |
Nil |
h Fine-grained slate, very much brokes, with seams of quartz. The surface of slickensides was coated with calcite. Nosulphides visible. |
Foot-wall of auriferous reef from the "Wealth of Nations." |
4.43 |
176 |
74 |
0.16 |
0.0011 |
0.55 |
i Fine-grained slate, contained large quantity of pyrite and arsenopyrite. |
From same level, 10 feet farther from the reef. |
4.48 |
904 Nearly all sulphides. |
687 |
1.02 |
0.017 |
8.5 |
j Solid slate, with a vein of quartz about ½-inch wide. Sulphides visible in fair quantity. |
From same level, 58 feet farther from the reef. |
4.48 |
703 |
489 |
0.73 |
0.0002 |
0.1 |
k Solid, Very hard slate, no sign of breaking. Showed no sulphides. |
From same level, 90 feet farther from the reef. |
4.48 |
217 No sulphides. |
83 |
Trace. |
Nil. |
Nil. |
l Solid slate, showing no sign of either quartz or pyrite. |
From same level. 135 feet farther from the reef. |
4.48 |
224 |
83 |
Nil. |
Nil. |
Nil. |
m. Sohil slate, but showing pyrite and arsenopyrite freely. |
From same level, 200 feet farther from the reef |
4.48 |
618 |
504 |
1.06 |
Nil. |
Nil. |
Table XVI.—Analyses of Samples of Soft Decomposed Andesite (Pronylite) from Moanataiari Tunnel.
Sample. |
Approximate Distance from Auriferous Reef. |
Weight Examined. |
Weight of Concentrates Obtained. |
Weight of Concentrates of Specific Gravity over 3.18. |
Percentage of Sulphur. |
Yield of Gold. |
Yield of Gold per Ton of Country-Rock. |
Yield of Silver. |
Yield of Silver per Ton of Country-Rock. |
|
Feet. |
Lbs. |
Grs. |
Grains. |
|
Grains. |
Grains. |
Grains. |
Oz. dwt. grs. |
A. Grayish propylite, snowing pyrite in good quantity, 20 feet from the Moanataiari fault. |
50 From No. 9 Moanataiari Reef. |
4.48 |
1246 |
716 |
1.03 |
0.0007 |
0.35 |
8.5 |
8.17.16 |
A′ Grayish propylite, showing pyrite in good quantity, 20 feet from the Moanataiari fault. |
50 From No. 9 Moanataiari Reef. |
2.24 |
479 |
208 |
0.56 |
0.0006 |
0.6 |
3.34 |
6.19.4 |
B. Light-brown propylite, showing very little pyrite; from the foot-wall of a small auriferous leader. Concentrates contained very little sulphides. |
55 From No. 9. Reef close to a small leader 6 in. wide. |
4.48 |
516 |
140 |
0.086 |
0.0013 |
0.65 |
0.0068 |
Grains. 3.4 |
C. White propylite, showing large quantity of pyrite; from the hanging-wall of a small auriferous leader. Concentrates contained good percentage of pyrite. |
55 From No. 9. Reef close to a small leader 6 in. wide. |
4.48 |
1064 |
733 |
1.25 |
Nil. |
Nil. |
0.0163 |
8.15 |
D. Soft gray propylite, showing very little pyrite. Concentrates showed only a little pyrite. |
60 From No. 9; 20 ft. from a leader. |
4.48 |
643 |
217 |
0.38 |
0.0003 |
0.15 |
0.0051 |
2.15 |
E. Hard bluish-gray propylite, foot-wall of a small auriferous quartz-vein, about 4 inches wide. No pyrite visible. |
65 From No. 9; foot-wall of a'rif's ld'r. |
4.48 |
412 |
103 |
0.18 |
Nil. |
Nil. |
0.0017 |
0.85 |
F. Quartz-vein, mentioned under "E," 4 inches wide. All assayed. |
|
1000 grs. |
|
|
|
|
345.0 |
|
151. |
G. Soft, light-brown propylite, from the vicinity of a "slide," dipping north 30°. The sample showed little pyrite. Concentrates contained good percentage of pyrite. |
70 From No. 9; 20 ft. from a'rif's ld'r. |
2.24 |
873 |
495 |
0.84 |
0.0012 |
1.2 |
0.019 |
19. |
H. Hard, gray propylite, showing no sulphides; from solid country, midway between two slides. Concentrates contained very little sulphides. |
70 From No. 9; 20 ft. from a flat qu'rz-seam, non-auriferous. |
4.48 |
317 |
90 |
0.062 |
Nil. |
Nil. |
0.0012 |
0.6 |
I. White propylite, showing bluish patches, which gave the sample a mottled appearance. Plentifully impregnated with pyrite. Concentrates contained large percentage of pyrite. |
20 From Don Pedro Re'f; 8 ft. from a slide dipping W. 70° |
4.48 |
1132 |
795 |
1.32 |
0.0007 |
0.35 |
0.0237 |
4.74 |
J. Propylite brown from oxidation, which has probably gone on since the tunnel was opened. From the hanging-wall of Don Pedro vein; auriferous quartz, averaging about 10 inches wide. No sulphides visible in the sample. |
3 From Don Pedro Re'f. |
4.48 |
375 |
209 |
0.44 |
Nil. |
Nil. |
0.0008 |
0.4page 84 |
K. Quartz from Don Pedro vein, showing a good quantity of pyrite. All assayed. |
From the vein. |
1000 |
|
|
|
|
393 |
|
177. |
L. Hard, gray propylite, oxidized on outside No sulphides visible. |
1 to the foot-wall side. |
4.48 |
717 |
289 |
0.74 |
Nil. |
Nil. |
Nil. |
Nil. |
M. Light brown propylite from solid country between Don Pedro vein and the nearest slide. Very little pyrite visible. |
20; about 20 feet from the slide. |
4.48 |
316 |
143 |
0.19 |
Nil. |
Nil. |
Nil. |
Nil. |
N. Gray propylite with black stringer ½-inch wide, from near the Don Pedro reef. Concentrates obtained showing a good quantity of pyrite. |
8 |
1.12 |
615 |
419 |
0.75 |
0.0019 |
3.8 |
0.0037 |
7.4 |
O. White propylite from seam 3 inches wide. The propylite showed a little pyrite. Concentrates contained a good percentage of pyrite. |
15 |
1.12 |
317 |
183 |
0.36 |
0.0036 |
7.2 |
0.0179 |
35.8 |
P. Hard, gray propylite from the vicinity of a black seam dipping north. No sulphides visible. Concentrates contained very little sulphides. |
34 |
4.48 |
254 |
78 |
0.21 |
Nil. |
Nil. |
Nil. |
Nil. |
Q. Mixture of white and bluish-white propylite, with a small quartz vein attached. No sulphides visible. Concentrates contained a fair percentage of pyrite. |
65 East. |
2.24 |
665 |
248 |
0.46 |
0.007 |
7. |
0.0025 |
2.5 |
R. Hard, bluish-white propylite in solid country. Concentrates contained very little sulphides. |
100 |
4.48 |
216 |
64 |
0.37 |
Nil. |
Nil. |
Nil. |
Nil. |
S. "White, soft propylite from near a fault-seam filled with clay, strongly impregnated with sulphides. Concentrates nearly all sulphides. |
13 0 |
4.48 |
1032 |
719 |
1.03 |
0.0009 |
4.5 |
0.0087 |
4.35 |
T. Gray propylite from the hanging-wall of a quartz reef 2 inches wide. A little pyrite visible in the sample. Concentrates contained a good proportion of pyrite. |
150 |
2.24 |
317 |
194 |
0.46 |
Nil. |
Nil. |
Nil. |
Nil. |
U. Soft, whitish propylite near small slide. Good percentage of pyrite in sample. Concentrates contained a good deal of pyrite. |
110 |
4.48 |
604 |
473 |
0.83 |
0.0005 |
0.25 |
0.0019 |
0.95 |
Z. Moderately hard, gray propylite, brown on outside, due to ferric oxide. Showed small quantity of pyrite. Concentrates contained good proportion at pyrite. |
50 |
2.24 |
375 |
190 |
0.44 |
0.0013 |
1.3 |
0.0062 |
6.2 |
A1. Fairly hard, greenish propylite, white in the more decomposed parts Showed pyrite freely. Concentrates contained good proportion of pyrite. |
30 |
4.48 |
846 |
615 |
0.92 |
0.0009 |
0.45 |
0.0081 |
4.5 |
B1. Soft, white propylite, showing large quantity of pyrite. Concentrated nearly all pyrite. |
6 |
4.48 |
770 |
646 |
1.02 |
0.0018 |
0.9 |
0.0012 |
0.60 |
E1. Soft, white propylite, with dark veins of ferrous sulphate, as well as much pyrite. Concentrates nearly all pyrite. |
Beside the reef. |
4.48 |
512 |
396 |
0.59 |
0.0032 |
1.6 |
0.0025 |
1.25 |
Table XVII.—Analyses of Samples of Hard Andesite from Two Belts of Unkindly Country in Moanataiari Tunnel, Thames.
Sample. |
Weight Examined. |
Weight of Concentrates. |
Weight of Concentrates of Specific Gravity over 3.18 |
Percentage of Sulphur. |
Yield of Gold |
Yield of Gold per Ton of County-Rock. |
Yield of Silver. |
Yield of Silver per Ton of Country-Rock. |
|
Lbs. |
Grains |
Grains. |
|
Grains. |
Grains. |
Grains. |
Grains. |
a. Very dense dark-blue andesite; showed no sulphides. Concentrates contained no sulphides. |
4.48 |
342 |
53 |
Trace. |
Nil. |
Nil. |
Nil. |
Nil. |
b. Very dense dark-blue andesite, from within 2 feet of a hard white quartz-vein Non-auriferous. Concentrates contained no sulphides. |
4.48 |
209 |
67 |
Nil. |
Nil. |
Nil. |
Nil. |
Nil. |
c. Decomposed band of brownish andesite; from hanging-wall of same quartz-vein. Showed pyrite in very small quantity. Concentrates contained fair proportion of pyrite. |
4.48 |
530 |
239 |
0.38 |
Nil. |
Nil. |
0.0008 |
0.04 |
d. Decomposed band of brownish andesite; showed a little more pyrite. Concentrates contained fair proportion of pyrite. |
4.48 |
575 |
270 |
0.41 |
0.0003 |
0.15 |
0.0017 |
0.85 |
e. Very hard blue andesite; showed no sign of pyrite. Concentrates contained no sulphides. |
4.48 |
116 |
29 |
Nil. |
Nil. |
Nil. |
Nil. |
Nil. |
f. Andesite, slightly decomposed, varying from blue to brown; showed no sulphides. Concentrates contained no sulphides. |
4.48 |
279 |
84 |
Nil. |
Nil. |
Nil. |
Nil. |
Nil. |
g. Greenish andesite, soft and much decomposed; showed a good deal of pyrite in the most decomposed parts. Concentrates nearly all sulphides. |
4.48 |
438 |
378 |
0.68 |
0.0072 |
3.56 |
0.0039 |
1.95 |
h. Greenish andesite, soft and much decomposed; showed a good deal of pyrite in the most decomposed parts. Concentrates from the sample met with an accident. |
4.48 |
|
|
|
|
|
|
|
i. Greenish andesite, soft and much decomposed; showed a good deal of pyrite in the most decomposed parts. Concentrates from the sample met with an accident. |
4.48 |
|
|
|
|
|
|
|
j. Much decomposed grayish-green andesite, quite white in patches, from near a leader of barren quartz. Sample showed no pyrite. Concentrates contained very little pyrite. |
4.48 |
347 |
74 |
0.057 |
Nil. |
Nil. |
Nil. |
Nil. |
k. Much decomposed grayish-green andesite, quite white in patches, from near a leader of barren quartz. Sample showed no pyrite. Concentrates not analyzed. |
|
|
|
|
|
|
|
|
l. Solid, very hard blue andesite, very little decomposed, and showing no sign of pyrite. Concentrates contained no sulphides. |
4.48 |
189 |
32 |
Nil. |
Nil. |
Nil. |
Nil. |
Nil. |
m. Solid, very hard blue andesite, very little decomposed, and showing no sign of pyrite. Concentrates contained no sulphides. |
4.48 |
237 |
75 |
Nil. |
Nil. |
Nil. |
Nil. |
Nil. |
n. Solid, very hard blue andesite, very little decomposed, and showing no sign of pyrite. Concentrates contained no sulphides. In the case of samples marked * the whole of the sample after concentration was assayed after the concentrates had been examined. |
4.48 |
375 |
47 |
Nil. |
Nil. |
Nil. |
Nil. |
Nil.page 86 |
o. Greenish blue, slightly decomposed andesite taken from near a small quartz-vein 1 inch wide, not auriferous. Sample showed a very little pyrite. Concentrates contained a little pyrite. |
4.48 |
304 |
103 |
0.19 |
Nil. |
Nil. |
0.0004 |
0.2 |
p. Greenish blue, slightly decomposed andesite, taken from near a small quartz-vein, 1 inch wide, not auriferous. Sample showed a very little pyrite. Concentrates not analyzed. |
|
|
|
|
|
|
|
|
q. Mottled blue and gray andesite, fairly hard, 20 feet northeast of the great Moanataiari fault. Sample showed a little pyrite in the more decomposed parts Concentrates contained a fair quantity of pyrite. |
4.48 |
635 |
270 |
0.39 |
0.0005 |
0.25 |
0.0117 |
5.85 |
r. Hard, blue andesite, very little decomposed. No sign of sulphides. Concentrates contained no sulphides. |
4.48 |
173 |
27 |
Nil. |
Nil. |
Nil. |
Nil. |
Nil. |
s. Mottled gray and blue andesite, little decomposed. Showed very little sulphide. Concentrates contained no sulphides. |
4.48 |
219 |
80 |
0.016 |
Nil. |
Nil. |
Nil. |
Nil. |
t. Hard, blue andesite, not at all decomposed. No sulphides. Concentrata contained no sulphides. |
4.48 |
346 |
73 |
Trace. |
|
Button lost. |
|
|
u. Hard, blue andesite, not at all decomposed. No sulphides. Concentrates contained no sulphides. In the case of samples marked * the whole of the sample left after concentration was assayed after the concentrates had been examined. |
4.48 |
204 |
34 |
Trace. |
Nil. |
Nil. |
Nil. |
Nil. |
Table XVIII.—Analyses of Various Minerals Isolated from, the Older Crystalline and Newer Eruptive Rocks of New Zealand, Victoria and Queensland.
A. Rocks of New Zealand.
Sample. |
Locality. |
Weight Taken. |
Mineral Isolated. |
Weight of Mineral Isolated. |
Method of Separation. |
Sulphides. |
Results. |
|
|
Gms. |
|
Gms. |
|
|
|
1. Gneiss, containing veins of mica, about ½-inch wide, mixed with quartz. Several pounds' weight of mica were easily obtained. |
From the "Staircase," on the Sutherland Falls road, Mil-ford Sound, W. Coast of Otago. |
200 |
Mica. |
200 |
Picked by hand. |
None. |
No gold or silver found. |
2. Gneiss, containing veins of mica, about ½ inch wide, mixed with quartz. Several pounds' weight of mica were easily obtained. |
From the "Staircase," on the Sutherland Falls road, Mil-ford Sound, W. Coast of Otago. |
150 |
Mica. |
150 |
Picked by hand. |
None |
No gold or silver found. |
3. Granite, with muscovite in large plates, easily picked out of sample. |
Clinton Gorge, N.W. of Lake Te Anau, on Milford Sound road. |
150 |
Mica |
150 |
Picked by hand. |
None |
No gold or silver found. |
4. Gneiss; contained veins of muscovite, from which pieces 2 inches square were easily picked out. |
Roaring Creek, Arthur River Valley, near Milford Sound. |
100 |
Mica |
100 |
Picked by hand. |
None |
No gold or silver found. |
5. Gneiss; contained veins of muscovite, from which pieces 2 inches square were easily picked out. |
On the track between Milford Sound and Lake Ada, W. Coast of Otago. |
100 |
Mica |
100 |
Picked by hand. |
None |
No gold or silver found. |
6. Syenitic gneiss, consisting of quartz, feldspar and hornblende, with a little biotite, the hornblende in a seam about 2 inches wide. Pyrrhotite and chalcopyrite, with minute specks of native copper, associated with the hornblende. Five hundred grammes of the rock gave 53 grammes of sulphides, mostly pyrrhotite, which contained 0 0053 grammes of silver. |
Dusky Sound, W. Coast of Otago. |
|
Hornblende. |
|
Picked by hand. |
See note below. |
See note below. |
7. Syenite. |
Dusky Sound, W. Coast of Otago. |
500 |
Hornblende |
113 |
Sons't's solution |
None. |
No gold or silver. |
8. Syenitie gneiss. A vein of hornblende about 2 inches wide occupied the greater part of the sample analyzed. |
Milford Sound, W. Coast of Otago. |
100 |
Hornblende. |
100 |
Picked by hand. |
None. |
No gold or silver. |
9. Syenite porphyry, showing large patches and crystals of hornblende. |
Preservation Inlet, W. Coast of Otago. |
100 |
Hornblende. |
100 |
Picked by hand. |
None. |
No gold or silver. |
10. Syenite porphyry, showing large patches and crystals of hornblende. |
West Jacket Arm, W. Coast of Otago. |
140 |
Hornblende. |
140 |
Picked by hand. |
None. |
No gold or silver.page 88 |
11. Syenitic gneiss, consisting of quartz, feldspar and biotite, with patches of hornblende. Sample showed pyrrhotite and pyrite. Five hundred grammes grave 18.56 grammes of these minerals chiefly, but no gold or silver was found. |
George Sound, W. Coast of Otago. |
500 |
|
|
|
See note below. |
See note below. |
12. "Granite," a rock containing pink feldspar, quartz, muscovite and bands of hornblende. |
George Sound, W. Coast of Otago. |
200 |
Hornblende. |
200 |
Picked by hand. |
None. |
No gold or silver. |
13. "Granite," a rock containing orthoclase, quartz, muscovite and hornblende in veins. One thousand grammes gave 1218 grammes pyrrhotite and arsenopyrite, which yielded no gold or silver. |
George Sound, W. Coast of Otago. |
1000 |
Hornblende. |
|
Picked by hand. |
See note below. |
See note below. |
14. Chlorite-schist containing numerous octahedral crystals of magnetite. |
Skippers Creek, Central Otago. |
|
Magnetite. |
250 |
Magnet. |
None. |
No gold or silver. |
15. Hornblende-schist, contain at numerous octahedral crystals of magnetite. |
Shotover River. Central Otago. |
|
Magnetite. |
150 |
Magnet. |
None. |
No gold or silver |
16. Heavy "black sand." result of erosion of mica-schist. Note 2 |
Shotover River, Central Otago. |
|
Magnetite. |
180 |
Magnet. |
None. |
No gold or silver. |
17. "Diorite," consisting of triclinic feldspar, hornblende, biotite. magnetic and a little qnartz. One thousand grammes gave 4.934 grammes of pyrite, containing 0037 grain of gold and 0.0041 grain of silver. |
Portobello, Otago Peninsula, near Dunedin. |
|
|
|
|
See note below. |
See note below, |
18. Diorite. like No. 17. |
Portobello, Otago Peninsula, near Dunedin. |
500 |
|
Hornblende, 57 Mica, 43 |
Sonstadt's Solution. |
None. |
No gold or silver. |
19. Diorite. like No. 17. |
Portobello Otago Peninsula, near Dunedin. |
500 |
|
Biotite, 38 Hornblende, 26 |
Sonstadt's Solution. |
None. |
No gold or silver. |
20. Phono lite. |
Near Dunedin. |
|
Magnetite. |
60 |
Magnet. |
None. |
No gold or silver. |
21. Basalt, very much decomposed, with large, undecomposed crystals of augite and hornblende. |
Water of Leith, near Dunedin. |
|
Hornblende, 2.8 to 3 Augite, 3 to 3.2 |
16 25 |
Klein's Solution. |
None. |
No gold or silver |
22. Hard, solid basalt, from a quarry. |
Near Oamaru, Otago. |
|
Magnetite. |
80 |
Magnet. |
None. |
No gold or silver |
23. Gneiss-granite, with large folia of mica, easily picked out of sample. |
Cape Foulwind, W. Coast of Nelson. |
|
Mica. |
200 |
Picked by hand. |
None. |
No gold or silver |
24. Fine-grained granite. |
Inangahu a River, Reef-ton. |
500 |
Mica. |
84 |
Klein's Solution. |
None. |
No gold or silver. |
25. Fine grained granite. |
Cape Foulwind quarries, W. Coast of Nelson, N. Z. |
500 |
Mica. |
43 |
Sonstadt's Solution. |
None. |
No gold or silver.page 89 |
26. Granite, with a pyritous vein. One thousand grammes grave 28.92 grammes of arsenopyrite and pyrrhotite, with a little galena, and this yielded 0.0032 grain of gold and 0.0019 grain of silver. |
Rangitoto, Westland, N.Z. |
Gms. |
|
Gms. |
Klein's Solution. |
See note below. |
See note below. |
27. Granite. |
Bed of Hokitika river, West land. N. Z. |
500 |
Mica. |
48 |
Klein's Solution. |
None. |
No gold or silver |
28. Gneiss. |
Bligh Sound, W. Coast Otago. |
500 |
Mica. |
61 |
Klein's Solution. |
None. |
No gold or silver. |
29. Nepheline andesite, hard, very little decomposed. |
Moanataian tunnel, Thames district. |
1000 |
Pyroxenes of sp. gr. 2.9 to 3.2 |
73 |
Klein's Solution. |
None. |
No gold or silver. |
30. Hard blue hornblende-andesite. |
Moanataiari tunnel. Thames district. |
1000 |
Hornblende and chlorite between sp. gr. 2.8 and 3.1. |
56 |
Klein's Solution. |
None. |
No gold or silver. |
31. Hornblende-andesite, slightly altered. |
Waitekauri creek, Thames district. |
1000 |
Hornblende and chlorite between sp. gr. 2.8 and 3.1. |
65 |
Klein's Solution. |
None. |
No gold or silver. |
32. Augite andesite, with much chlorite. |
Moanatairi tunnel, Thames district. |
1000 |
Pyroxen's between sp. gr. 2.9 and 3.2. |
43 |
Klein's Solution |
None. |
No gold or silver. |
33. Hard blue unaltered augite-andesite. |
Fame and Fortune, G. M. Co., Thames. |
1000 |
Pyroxen's between sp. gr. 2.9 and 3.2. |
84 |
Klein's Solution. |
None. |
No gold or silver. |
34. Hard blue unaltered augite-andesite. |
Fame and Fortune G. M. Co.. Thames. |
500 |
Pyroxen's between sp. gr. 2.9 and 3.2. |
27 |
Klein's Solution. |
None. |
No gold or silver. |
B. Rocks of Victoria. |
35 "Diorite" dike, near auriferous reef, Walhalla, Gippsland, Victoria. |
900 ft.level Long Tunnel, G. M. Co. |
1000 |
Hornblende. |
73 |
Klein's Solution. |
None. |
No gold or silver. |
36 "Diorite." associated with copper-lode. Showed chalcopyrite, of which there were obtained from 1000 grammes of the rock 16.48 grammes (with a small quantity yielding 0.407 grain of silver and no gold. |
Thomson river, ne'r Walhalla. Gippsland. Vict. |
1000 |
|
|
|
See note below. |
See note below. |
37. "Diorite." like No. 36. |
Thomson river, ne'r Walhalla. Gippsland. Vict. |
1000 |
Hornblende. |
38 |
Klein's Solution. |
None. |
No gold or silver. |
38. Syenitic granite (quartz, orthoclase and muscovite. with large crystals of hornblende). One thousand grammes gave 16.03 grammes of pyrite, yielding neither gold nor silver. |
Big Hill, Bendigo, near the Silurian boundary. |
|
Hornblende. |
|
|
See note below. |
See note below. |
39. Syenitic granite, like No. 38. |
Big Hill, Bendigo, near the Silurian boundary. |
500 |
Mica. |
53 |
Klein's Solution. |
None. |
No gold or silver. |
40. Granite. |
Big Hill, Bendigo, near the Silurian boundary. |
500 |
Mica. |
84 |
Klein's Solution. |
None. |
No gold silver. |
41. Syenite. |
From Gabo Island. S. E. of Vict., used as a building stone in Melbourne. |
1000 |
Hornblende. |
96 |
Klein's Solution. |
None. |
No gold or silver. |
42. Very dense basalt, overlying auriferous slates. |
Ballarat East, Victoria. |
|
Magnetite. |
50 |
Magnet. |
None. |
No gold or silver. |
43. Vesicular basalt. |
Sunbury, near Melbourne, Victoria. |
Magnetite. |
40 |
Magnet. |
None. |
No gold or silver.page 90 |
C. Rocks of Queensland. |
44. |
Quartz-mica diorite (tonalite: the "granite" of Charters Towers). |
The 1070-ft. level, Brilliant & St. George G. M. Co.. Charters Towers Queensland. |
500 |
Sp. gr. 2.75 to 3 (biotite). Sp. gr. 3 to 3.2 (hornblende). |
21 |
Klein's Solution. |
None. |
No gold or silver. |
|
|
|
|
50 |
|
|
|
45. |
Quartz mica diorite (tonalite: the "granite" of Charters Towers). |
The 1070-ft. level, Brilliant and St. George G. M. Co., Chartere Towers, Queensland. |
500 |
Sp. gr. 2.75 to 3, obiotite). Sp. gr. 3 to 3.2 (hornblende). |
47 |
Klein's Solution. |
None. |
No gold or silver. |
|
|
|
|
40 |
|
|
|
46. |
Diorite-aphanite, with much carbonate of lime (calc-aphanite); a very much altered rock; effervesces strongly with acid (the "greenstone" of the Gympie gold-field). It contains pyrite and sphalerite in small quantities. One thousand grammes gave 8.42 grammes of pyrite, yielding no gold or silver. |
The 950-ft. level of the No. 5 North Phoenix G. M. Co., Gympie. |
1000 |
|
36 |
|
See note below. |
See note below. |
47. |
Diorite-aphanite, with much carbonate of lime (calc-aphanite); a very much altered rock; effervesces strongly with acid (the "greenstone" of the Gympie gold-field). One thousand grammes gave 42.7 grammes of pyrite and galena, which yielded 0.0016 grain of gold and 0.0037 grain of silver. |
The 950-ft. level of the No. 5 North Phoenix G. M. Co., Gympie. |
1000 |
|
25 |
|
See note below. |
See note below. |
Table XIX.—Examination of Mine-Waters of the Vadose Region for Free Acid and Ferric Salts.
Sample. |
Country-Rock. |
Reaction to Test-Paper. |
Free Acid in Grammes per Liter before Exposure to Air. |
Free Acid in Grammes per Liter after Exposure to Air. |
Total Weight of Iron in Grammes per Liter. |
Iron Present as Ferric Salts. |
Iron Present as Ferrous Salts. |
|
|
|
HC1. |
H2SO4. |
HC1. |
H2SO4. |
|
|
|
a. From the Whau mine, Thames, N. Z. Contained a large quantity of iron in solution. Color, wine-red. Sp. gr., 1.021. |
Prop'lite highly pyritous. |
Strongly acid. |
0.446 |
7.901 |
0.446 |
8.650 |
3.198 |
2.431 |
0.767 |
b. From Maria reef, Karangahake, Thames, N. Z. Deposited a large quantity of ferric hydroxide on standing. |
Prop'iite highly pyritous. |
Strongly acid. |
0.287 |
Nil. |
0.592 |
1.3842 |
2.471 |
0.946 |
1.525 |
c. From Woodstock reef, Thames, N. Z. Behaved on standing like sample b. |
Prop'iite highly pyritous. |
Acid. |
0.065 |
Nil. |
0.208 |
Nil. |
1.086 |
0.731 |
0.355 |
d From the Alburnia mine, Thames, N. Z. In appearance like sample a. Sp. gr., 1.019 |
Prop'iite highly pyritous. |
Strongly acid. |
0.506 |
6.078 |
0.506 |
8.921 |
2.017 |
0.896 |
1.111 |
e. From the Grace Darling mine, Thames, N. Z. Nearly clear; slight deposit of ferric hydroxide on standing. |
Prop'iite highly pyritous. |
Acid. |
0.079 |
Nil. |
0.361 |
Nil. |
0.968 |
0.834 |
0.134 |
f. From the Martha mine, Waihi, Thames, N. Z. Appearance and behavior on standing like sample e. |
Propylite and rhyolite. |
Acid. |
0.216 |
Nil. |
0.465 |
0.380 |
0.758 |
0.210 |
0.548 |
g. From the Crown mine, Karangahake, Thames, N. Z. Like samples e and f. |
Propylite, pyritous. |
Acid. |
0.409 |
1.063 |
0.605 |
1.582 |
1.903 |
1.127 |
0.776 |
h. From the Tipperary mine, Macetown, Otago. Clear. |
Mica-schist. |
Neutral. |
Nil. |
Nil. |
Nil. |
Nil. |
0.095 |
0.027 |
0.068 |
i. From the Premier mine, Macetown, Otago. Clear. |
Mica-Schist. |
Neutral. |
Nil. |
Nil. |
Nil. |
Nil. |
0.872 |
0.305 |
0.567 |
j. From the Long Tunnel, Walhalla, Victoria. Clear. |
Slate and sandstone. |
Highly acid. |
Nil. |
Nil. |
Nil. |
Nil. |
0.569 |
0.481 |
0.088 |
k. From the Bonanza mine, Nenthorn, Otago. Clear. |
Mica schist. |
Highly acid. |
0.087 |
Nil. |
0.105 |
Nil. |
1.007 |
0.783 |
0.224 |
l. From a quartz-reef near Roxburgh, Otago. Reddish; deposited a good quantity of ferric hydroxide on standing. |
Mica schist. |
Strongly acid. |
0.658 |
Nil. |
0.816 |
Nil. |
1.569 |
1.406 |
0.163 |
m. From the Bella reef, Waipori, Otago. Clear. |
Mica schist. |
Slightly acid. |
0.064 |
Nil. |
Nil. |
Nil. |
0.987 |
0.639 |
0.348 |
n. From the Gabriel's Gully reef, Lawrence, Otago. Clear. |
Mica schist. |
Neutral. |
Nil. |
Nil. |
Nil. |
Nil. |
0.640 |
0.379 |
0.261 |
o. From the Game Hen reef, Hindon, Otago. Clear. |
Mica schist. |
Acid. |
Nil. |
Nil. |
0.406 |
Nil. |
1.206 |
0.217 |
0.989 |
p. From the reef on Sovereign Hill, Ballarat, Victoria. Clear. |
Slate and sandstone. |
Neutral. |
Nil. |
Nil. |
Nil. |
Nil. |
0.489 |
0.426 |
0.063 |
q. From the reef on Big Hill, Bendigo, Victoria. Clear. |
Slate and sandstone. |
Neutral. |
Nil. |
Nil. |
Nil. |
Nil. |
0.602 |
0.578 |
0.024 |
Table XXII.—Analyses of Rocks from the Vadose Region Otago, New Zealand.
Sample. |
Distance from Auriferous Reef. |
Approx. Depth Below Surface. |
Locality. |
Weight Taken. |
Weight of Concentrates. |
Percentage of Sulphur. |
Yield of Gold. |
Yield of Gold Ton Country-Rock. |
|
Feet. |
Ft. |
|
Lbs. |
Grains. |
|
Grains. |
Grs. |
a. Mica-schist, yellowish color, soft, very much decomposed. |
4 |
40 |
From a tunnel driven along the Bella reef, Waipori, Otago. |
4.48 |
643 Mostly mica and oxide of iron. |
Nil. |
0.0016 |
[unclear: 0.8] |
b. Mica-schist, yellowish color, soft, very much decomposed. |
20 |
40 |
From a tunnel driven along the Bella reef, Waipori, Otago. |
4.48 |
1246 |
Nil. |
0.0107 |
5.15 |
c. Mica-schist, yellowish color, soft, very much decomposed. |
3 |
50 |
From a tunnel driven along the Bella reef, Waipori, Otago. |
4.48 |
1675 |
Nil. |
0.065 |
32.55 |
d. Hard mica-schist, with quartz-bands ½-inch wide. Specimen much stained with oxide of iron. |
60 |
30 |
Near the mouth of the low-level tunnel, Tipperary G. M. Co., Macetown, Otago. |
4.48 |
1217 |
Nil. |
Nil. |
Nil. |
e. Ferric oxide from a slight fault in mica-schist, showing a little quartz in [unclear: vein] |
35 |
60 |
From the same tunnel, but 25 feet nearer the reef. |
2.24 |
1176 |
Trace. |
0.0179 |
[unclear: 17.5] |
f. Quartz and ferric oxide from broken country. |
20 |
70 |
From the same tunnel, 15 feet nearer the reef. |
2.24 |
1030 |
Trace. |
0.0086 |
[unclear: 8.6] |
g. Solid mica-schist, much stained by ferric oxide. |
160 |
35 |
From near the mouth of the low-level tunnel, Premier G. M. Co, Macetown, Otago. |
1.12 |
774 |
Nil. |
0.0018 |
[unclear: 3.5] |
h. Ferric oxide and broken mica-schist, from a small fault. |
90 |
85 |
From the same tunnel, but nearer the reef and at a greater depth. |
2.24 |
617 |
Trace. |
Nil. |
Nil. |
i. Solid mica-schist, much discolored by ferric oxide. |
65 |
95 |
From the same tunnel, but 15 feet nearer the reef. |
2.24 |
612 |
Nil. |
0.0013 |
[unclear: 2.4] |
j. Much decomposed, very soft mica-schist, stained brown with ferric oxide. |
6 |
40 |
From the Bonanza reef, Nenthorn, Otago, within 6 feet of a rich auriferous reef. |
2.24 |
1738 Principally mica and ferric oxide. |
0.027 |
0.0016 |
[unclear: 11.5] |
k. Much decomposed, very soft mica-schist, stained brown with ferric oxide. |
3 |
40 |
From the same mine, at the same depth, but nearer the reef. |
2.24 |
1247 |
Nil. |
0.0073 |
[unclear: 7.5] |
l. Ferric oxide filling the space in joint-planes of phyllite, which forms [unclear: the] country-rock of this reef. |
600 |
20 |
From a cliff west of Saddle Hill reef, near Dunedin. |
1.12 |
726 |
0.008 |
Nil. |
Nil. |
m Decomposed phyllite, much stained with ferric oxide. |
200 |
20 |
From the same locality, but nearer reef. |
2.24 |
1073 |
Nil. |
0.0095 |
[unclear: 0.5] |