Great Unknown Gold Mine, Mount Jackson Goldfield, Yilgarn Shire, Western Australia, Australiai
| Regional Level Types | |
|---|---|
| Great Unknown Gold Mine | Mine |
| Mount Jackson Goldfield | Ore Field |
| Yilgarn Shire | Shire |
| Western Australia | State |
| Australia | Country |
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Latitude & Longitude (WGS84):
30° 11' 51'' South , 119° 15' 44'' East
Latitude & Longitude (decimal):
Locality type:
Köppen climate type:
GML 2063. Located 3 kilometres north-west of the Marda Dam, and 1.5 kilometres east south-east of Allen's Find. Its exact location in the present landscape is uncertain. It consists of only two shafts.
The No. 2 shaft is mentioned in the source in 1911, down to 98 feet with levels at 57, 81 and 141 feet. It had been driven for 225 feet at the 57 foot level, and 170 feet at the 141 foot level. The country rock the source states is totally different to Allen's Find, though the same series. It is carbonated ultra basic igneous rock, possibly peridotite. The ore body is a quartz reef in a chloritic shear zone, averaging 4 feet wide, and dipping vertically.
The shoots are 6 inches to 3 feet wide, but average 18 inches, and follow an irregular course in the shear zone. Within the country rock is a band of quartzite, striking east-west. This intrudes the ore channel, causing the reef to expand and envelope the quartzite breccia, reforming as a reef on the other side, still in the shear zone. The breccia forms a vertical pipe, with gold enrichment in the quartz reef near it. The ore shoots are vertical and parallel to the breccia body. There are 3 ore shoots, either side of the breccia, and one to the east. Coarse gold in the shoots is common.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsCommodity List
This is a list of exploitable or exploited mineral commodities recorded at this locality.Mineral List
13 valid minerals.
Rock Types Recorded
Note: data is currently VERY limited. Please bear with us while we work towards adding this information!
Select Rock List Type
Alphabetical List Tree DiagramDetailed Mineral List:
| ⓘ Arsenopyrite Formula: FeAsS Reference: Simpson, E.S. (1948), Minerals of Western Australia, Vol 3, p 544 |
| ⓘ Calcite Formula: CaCO3 Reference: Simpson, E.S. (1948), Minerals of Western Australia, Vol 3, p424 |
| ⓘ 'Chlorite Group' Reference: Simpson, E.S. (1917), The Geological and Mineral Resource of the Yilgarn Goldfield. The Belt North of Southern Cross. Part B- (Honman, C.S.), Mount Jackson and Marda Centres, (fieldwork 1914-1915), GSWA, Bulletin 71, 1917. |
| ⓘ Chromite Formula: Fe2+Cr3+2O4 Reference: Simpson, E.S. (1948), Minerals of Western Australia, Vol 3, p 95 |
| ⓘ Cuprite Formula: Cu2O Reference: Simpson, E.S. (1948), Minerals of Western Australia, Vol 3, p424 |
| ⓘ Galena Formula: PbS Reference: Simpson, E.S. (1948), Minerals of Western Australia, Vol 3, p 544 |
| ⓘ Gold Formula: Au Reference: Simpson, E.S. (1917), The Geological and Mineral Resource of the Yilgarn Goldfield. The Belt North of Southern Cross. Part B- (Honman, C.S.), Mount Jackson and Marda Centres, (fieldwork 1914-1915), GSWA, Bulletin 71, 1917. |
| ⓘ 'Limonite' Reference: Simpson, E.S. (1948), Minerals of Western Australia, Vol 3, p 544 |
| ⓘ Magnesite Formula: MgCO3 Reference: Simpson, E.S. (1948), Minerals of Western Australia, Vol 3, p 95 |
| ⓘ Magnesite var. Mesitine Spar Formula: (Mg,Fe)CO3 Reference: Simpson, E.S. (1948), Minerals of Western Australia, Vol 3, p 95 |
| ⓘ Muscovite Formula: KAl2(AlSi3O10)(OH)2 Reference: Simpson, E.S. (1948), Minerals of Western Australia, Vol 3, p 95 |
| ⓘ Muscovite var. Sericite Formula: KAl2(AlSi3O10)(OH)2 Reference: Simpson, E.S. (1948), Minerals of Western Australia, Vol 3, p 95 |
| ⓘ Pyrite Formula: FeS2 Reference: Simpson, E.S. (1948), Minerals of Western Australia, Vol 3, p 544 |
| ⓘ Quartz Formula: SiO2 Reference: Simpson, E.S. (1917), The Geological and Mineral Resource of the Yilgarn Goldfield. The Belt North of Southern Cross. Part B- (Honman, C.S.), Mount Jackson and Marda Centres, (fieldwork 1914-1915), GSWA, Bulletin 71, 1917. |
| ⓘ Scorodite Formula: Fe3+AsO4 · 2H2O Reference: Simpson, E.S. (1948), Minerals of Western Australia, Vol 3, p 544 |
| ⓘ Sphalerite Formula: ZnS Reference: Simpson, E.S. (1948), Minerals of Western Australia, Vol 3, p424 |
| ⓘ Talc Formula: Mg3Si4O10(OH)2 Reference: Simpson, E.S. (1948), Minerals of Western Australia, Vol 3, p 95 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Gold | 1.AA.05 | Au |
| Group 2 - Sulphides and Sulfosalts | |||
| ⓘ | Arsenopyrite | 2.EB.20 | FeAsS |
| ⓘ | Galena | 2.CD.10 | PbS |
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| ⓘ | Sphalerite | 2.CB.05a | ZnS |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Chromite | 4.BB.05 | Fe2+Cr3+2O4 |
| ⓘ | Cuprite | 4.AA.10 | Cu2O |
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Calcite | 5.AB.05 | CaCO3 |
| ⓘ | Magnesite | 5.AB.05 | MgCO3 |
| ⓘ | var. Mesitine Spar | 5.AB.05 | (Mg,Fe)CO3 |
| Group 8 - Phosphates, Arsenates and Vanadates | |||
| ⓘ | Scorodite | 8.CD.10 | Fe3+AsO4 · 2H2O |
| Group 9 - Silicates | |||
| ⓘ | Muscovite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
| ⓘ | var. Sericite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
| ⓘ | Talc | 9.EC.05 | Mg3Si4O10(OH)2 |
| Unclassified Minerals, Rocks, etc. | |||
| ⓘ | 'Chlorite Group' | - | |
| ⓘ | 'Limonite' | - | |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Scorodite | Fe3+AsO4 · 2H2O |
| H | ⓘ Talc | Mg3Si4O10(OH)2 |
| H | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| H | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| C | Carbon | |
| C | ⓘ Calcite | CaCO3 |
| C | ⓘ Magnesite var. Mesitine Spar | (Mg,Fe)CO3 |
| C | ⓘ Magnesite | MgCO3 |
| O | Oxygen | |
| O | ⓘ Quartz | SiO2 |
| O | ⓘ Scorodite | Fe3+AsO4 · 2H2O |
| O | ⓘ Cuprite | Cu2O |
| O | ⓘ Calcite | CaCO3 |
| O | ⓘ Magnesite var. Mesitine Spar | (Mg,Fe)CO3 |
| O | ⓘ Talc | Mg3Si4O10(OH)2 |
| O | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| O | ⓘ Chromite | Fe2+Cr23+O4 |
| O | ⓘ Magnesite | MgCO3 |
| O | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Mg | Magnesium | |
| Mg | ⓘ Magnesite var. Mesitine Spar | (Mg,Fe)CO3 |
| Mg | ⓘ Talc | Mg3Si4O10(OH)2 |
| Mg | ⓘ Magnesite | MgCO3 |
| Al | Aluminium | |
| Al | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| Al | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| Si | ⓘ Talc | Mg3Si4O10(OH)2 |
| Si | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| Si | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| S | Sulfur | |
| S | ⓘ Pyrite | FeS2 |
| S | ⓘ Arsenopyrite | FeAsS |
| S | ⓘ Galena | PbS |
| S | ⓘ Sphalerite | ZnS |
| K | Potassium | |
| K | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| K | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Ca | Calcium | |
| Ca | ⓘ Calcite | CaCO3 |
| Cr | Chromium | |
| Cr | ⓘ Chromite | Fe2+Cr23+O4 |
| Fe | Iron | |
| Fe | ⓘ Scorodite | Fe3+AsO4 · 2H2O |
| Fe | ⓘ Pyrite | FeS2 |
| Fe | ⓘ Arsenopyrite | FeAsS |
| Fe | ⓘ Magnesite var. Mesitine Spar | (Mg,Fe)CO3 |
| Fe | ⓘ Chromite | Fe2+Cr23+O4 |
| Cu | Copper | |
| Cu | ⓘ Cuprite | Cu2O |
| Zn | Zinc | |
| Zn | ⓘ Sphalerite | ZnS |
| As | Arsenic | |
| As | ⓘ Scorodite | Fe3+AsO4 · 2H2O |
| As | ⓘ Arsenopyrite | FeAsS |
| Au | Gold | |
| Au | ⓘ Gold | Au |
| Pb | Lead | |
| Pb | ⓘ Galena | PbS |
References
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Year (asc) Year (desc) Author (A-Z) Author (Z-A)Simpson, E.S. (1917) The Geological and Mineral Resource of the Yilgarn Goldfield. The Belt North of Southern Cross. Part B- (Honman, C.S.) Mount Jackson and Marda Centres, (fieldwork 1914-1915), GSWA, Bulletin 71, 1917.
Other Regions, Features and Areas containing this locality
Australia
- Western Australia
- West Australian ElementCraton
- Yilgarn CratonCraton
Australian PlateTectonic Plate
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