登录注册
主页关于 MindatMindat手册Mindat的历史版权Who We Are联系我们于 Mindat.org刊登广告
捐赠给 MindatCorporate Sponsorship赞助板页已赞助的板页在 Mindat刊登 广告的广告商于 Mindat.org刊登广告
Learning CenterWhat is a mineral?The most common minerals on earthInformation for EducatorsMindat ArticlesThe Elements书籍及杂志
搜索矿物的性质搜索矿物的化学Advanced Locality Search随意显示任何一 种矿物Random Locality使用minID搜索邻近产地Search Articles搜索词汇表更多搜索选项
搜索:
矿物名称:
地区产地名称:
关键字:
 
Mindat手册添加新照片Rate Photos产区编辑报告Coordinate Completion Report添加词汇表项目
Mining Companies统计会员列表Mineral Museums矿物展及活动The Mindat目录表设备设置
照片搜索Photo Galleries今天最新的照片昨天最新的照片用户照片相集过去每日精选照片相集Mineral Photography

Oversight Gold Mine (Tara; Oversight Tara United), Broad Arrow, Broad Arrow Goldfield, Kalgoorlie-Boulder Shire, Western Australia, Australia

This page is currently not sponsored. Click here to sponsor this page.
Key
Lock Map
Latitude & Longitude (WGS84): 30° 27' 36'' South , 121° 20' 5'' East
Latitude & Longitude (decimal): -30.45997,121.33459
GeoHash:G#: qdw69ncju
Locality type:Mine
Köppen climate type:BSh : Hot semi-arid (steppe) climate


The Oversight and Tara were separate but adjoining leases, amalgamated in 1925. Present day the area is an east-west band of many modern tiny test diggings one kilometre south of Broad Arrow. These are immediately south of the Black Flag mines turn off, and cross the railway line and exist both east and west of the Goldfields Highway. This infrastructure has prevented the area being developed as a large open pit.

Both mines contained rich gold and were active at a later date than the main discoveries around Broad Arrow in the 1890's. It made at least five old prospectors extremely rich.

At the Oversight the original prospectors had sunk a 50 foot shaft, and only being interested in quartz had thrown the lode material containing gold on the dump. Later two other men put in a 100 foot east-west crosscut, then abandoned the lease. In 1915, two old experienced prospectors called Borland and Rudd (surnames) found rich gold at the mine, leading it to be named the Oversight.

One story states Borland and Rudd decided to dynamite a jutting rock that was annoying them as it was getting in the way of the bucket as it was hauled to the surface. The explosion revealed rich gold. Another story states the bucket swung and hit the side of the shaft, dislodged a piece of stone revealing gold. The leader in either case developed into a good body of stone showing specimen gold. One source states this patch alone produced 450 tonnes of ore worth 15 500 pounds.

Meanwhile Erickson and Godfrey (surnames) were working the adjoining Tara to the north from 1908 with similar results. The four men obtained in total about 50 000 pounds worth of gold, a fortune for the day. The Tara lease was 6 acres and the Oversight 12 acres in size

C.A. Barrett took over the mines in 1923, and amalgamated them as the Oversight Tara United. It was thought the mines had been worked out, but they still had more to give. 54 tonnes in 1926 yielded 104 ounces of specimen stone and 482 fine ounces from crushing. He found several further rich patches.

In 1919, the Oversight was taken over as a working option by a new company headed by Dorrie L. Doolette, floated in the eastern states for 6000 pounds. Around the same time the Tara which had produced over 20 000 pounds worth of gold for Erickson and Godfrey was let on option to a Kalgoorlie syndicate headed by Archibald O'Keefe.

The area immediately south of the old mines is owned by Taylor and Catchpole (surnames) since 1930, GML 1933W, who let out the mine on a working option to the Bardoc Consolidated Company in 1934. J. Echolm is mine manager, and six men are employed. A Huntington mill is installed and the company controls 96 acres. In 1937, the B.A.N.Z. company takes out an option on the Oversight mine. Little information was found subsequently on any of these companies making a success out of these ventures.

The lodes are a soft formation trending east-west, and to 4 feet wide. Within the lode is rich auriferous bearing quartz leaders and talcose schists. A large number of shafts are in the area, varying in depth from 50 to 200 feet. Most of the ore won was from relatively shallow depths. Water comes in at 150 feet, but the flow is not great.

From 1908 to 1925, the Tara produced 3174.28 ounces of specimen stone, and from 1194.24 tonnes of ore yielded 2088.59 ounces totalling 5262.87 ounces. The Oversight between 1915 to 1925 produced 2483.52 ounces from specimen stone and from 1222.95 tonnes of ore yielded 3734.96 ounces of gold totalling 6218.48 ounces. The combined area from 1925 to 1933 produced 983.6 ounces from specimen stone and 264.54 tonnes of ore yielding 727.25 ounces of gold totalling 1710.85 ounces. The total yield to 1933 was 13 192.20 ounces.





Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


3 valid minerals.

Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Cenozoic
0 - 66 Ma



ID: 880049
ferruginous duricrust 38498

Age: Cenozoic (0 - 66 Ma)

Description: Ferruginous duricrust, laterite; pisolitic, nodular, vuggy; may include massive to pisolitic ferruginous subsoil, mottled clays, magnesite, reworked products of ferruginous and siliceous duricrusts, calcrete, gossan; residual ferruginous saprolite

Comments: regolith; synthesis of multiple published descriptions

Lithology: Regolith

Reference: Raymond, O.L., Liu, S., Gallagher, R., Zhang, W., Highet, L.M. Surface Geology of Australia 1:1 million scale dataset 2012 edition. Commonwealth of Australia (Geoscience Australia). [5]

Neoarchean - Mesoarchean
2500 - 3200 Ma



ID: 3187503
Archean intrusive rocks

Age: Archean (2500 - 3200 Ma)

Comments: Yilgarn Craton

Lithology: Intrusive igneous rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License



This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
The Age newspaper (Melbourne) (1919), Oversight. Broad Arrow, 09/08/1922
Kalgoorlie Miner newspaper (1915), The Oversight Mine. A Broad Arrow Bonanza, 16/11/1915
The Beaudesert Times (1926), Mining Romance. How Fortune Were Hade (?). The Oversight of Broad Arrow, 05/11/1926
Kalgoorlie Miner newspaper (1934), Bardoc Consolidated. Option on Oversight Tara United, 11/10/1934
Kalgoorlie Miner newspaper (1934), Bardoc Consolidated. Broad Arrow Leases. Erection of Machinery, 08/10/1934
Western Argus newspaper (Kalgoorlie) (1919), Broad Arrow, 23/09/1919
Kalgoorlie Miner newspaper (1937), Mining Activity in the Broad Arrow District, 07/05/1937

 
矿物 and/or 产地  
版权所有© mindat.org1993年至2020年,除了规定的地方。 Mindat.org全赖于全球数千个以上成员和支持者们的参与。
隐私政策 - 条款和条款细则 - 联络我们 Current server date and time: 2020.2.20 02:12:52 Page generated: 2018.6.12 16:41:21
Go to top of page