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The Pamphlet Collection of Sir Robert Stout: Volume 66
Ironsands
Ironsands.
The following tabular statement given a particular account of iron sands.:—
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Ironsands of New Zealand.
The composition of the chief massive ores of iron may be illustrated by the following analyses :—
| Variety. | Locality. | Centesimal Composition. | Percentage of Iron. | ||||
|---|---|---|---|---|---|---|---|
| Magnitite. | Hæmatite. | Titanic Iron. | Siliceous Matters. | Water. | |||
| Impure magnetite | Manukau, Auckland | 60.20 | 37.90 | traces | 1.90 | 70.06 | |
| Magnetic | Dunstan Gorge, Otago | 86.32 | traces | 13.68 | 63.60 | ||
| Hæmatite | Dunstan, Otago | 96.11 | 3.89 | 68.30 | |||
| Magnetite | Dun Mountain, Nelson | 90.62 | 7.60 | 1.80 | 63.40 | ||
| Mixed magnetite and hæmatite | Maramaru, Auckland | 2.24 | 87.10 | traces | 10.66 | 62.30 | |
| Bog iron ore | Spring Swamp, Auckland | 73.17 | 13.83 | 13.00 | 51.22 | ||
| Brown iron ore | Raglan | 72.69 | 9.68 | 17.60 | 50.88 | ||
| Brown iron ore* | Kawau | 67.98 | 19.65 | 12.37 | 47.58 | ||
| Hydrous hæmatite† | Parapara, Nelson | 62.68 | 24.08 | 13.24 | 43.87 | ||
| Hydrous-hæmatite | Mount Peel, Nelson | 56-00 | |||||
| Carbonate of Iron | 56.9 |
| Carbonate of lime and magnesia | 2.8 |
| Siliceous matters | 40.3 |
| 100.0 |
The iron amounts to about 27 per cent.
Other large deposits of spathic iron ore have been found at Footers Coal Mine at the Miranda Redoubt, and Jenkins's Coal Mine, Nelson. They contain 40 per cent, and 41 per cent, of iron respectively.
| Variety. | Locality. | Protoxide of Iron. | Sesquioxide of Iron. | Carbonic Acid. | Silicates. | Per-centage of Iron. |
|---|---|---|---|---|---|---|
| Black-band | Collingwood, Nelson | 35.23 | 25.77 | 21.12 | 3.93 | 46.06 |
| Black-band | Collingwood, Nelson | 40.38 | 5.26 | 21.97 | 16.69 | 35.12 |
| Spathic | Miranda, Auckland | 40.08 | ||||
| Spathic | Jenkins's Mine, Nelson | 41.00 |
| Spathic Iron Ores. | ||
|---|---|---|
| Malvern Hills. | Collingwood. | |
| Protoxide of iron | 51.2 | 35.23 |
| Sesquioxido of iron | 25.77 | |
| Oxide of magnesia | .8 | 1.00 |
| Alumina | 1.8 | 2.11 |
| Magnesia | .4 | 1.94 |
| Lime | .3 | .71 |
| Silica | 13.6 | .90 |
| Sulpliuric acid | traces | |
| Carbonic acid | 31.2 | 21.12 not determined |
| Phosphoric acid | 31.2 | 21.12 not determined |
| Sulphide of iron | .41 | |
| Water | .7 | 1.96 |
| Organic matter | 5.72 | |
| Silicates undecomposed by acid | 3.03 | |
| amit | 100.0 | 99.90 |
Hæmatite, containing about 40 per cent, of iron, occurs intermixed with quartz pebbles, in a stratum 100ft. thick exposed over several acres, at Parapara, Nelson, and from it an excellent paint is manufactured, which, being a pure peroxide of iron, is the best preservative for that metal. Wood coated with this paint is comparatively non-inflammable, and it is therefore much used in painting wooden buildings.
* Manganese oxide, 1.38.
† Contains a little manganese.