incorrect - the country not the mine Tag: Manual revert |
Spinningspark (talk | contribs) →Project history: wikilink artisanal mining |
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==Project history== |
==Project history== |
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Kubi was explored by [[BHP]] from 1988 to 1994, who concentrated drilling in an area of pre-existing artisanal mining. Exploration was continued by [[Nevsun Resources]] of Canada, until in 1998 [[Ashanti Goldfields]] [[Option contract|optioned]] the property and in 2005<ref>{{cite web |title=2005 Annual Report |url=https://www.aga-reports.com/05/annualreport05/report/pdf/ar_report_2005.pdf |publisher=AngloGold Ashanti Limited |access-date=30 January 2022 |location=Johannesburg |page=65 |date=28 February 2006}}</ref> [[AngloGold Ashanti]] established two small [[Open-pit mining|open pits]] to mine 500,230 tonnes of shallow oxide [[ore]] at a grade of 3.65 g/t gold to recover 58,696 [[Troy weight#Troy ounce (oz t)|troy ounces]]. The ore was trucked to AngloGold's plant at [[Obuasi Gold Mine|Obuasi]] for processing.<ref name=farrow/> Prior to mining AngloGold Ashanti's [[Mineral resource classification#Mineral reserves and ore reserves|mineral reserve estimate]] was 550,455 tonnes at a grade of 3.37 g/t gold, totaling 59,637 troy ounces.<ref name=smith/> |
Kubi was explored by [[BHP]] from 1988 to 1994, who concentrated drilling in an area of pre-existing [[artisanal mining]]. Exploration was continued by [[Nevsun Resources]] of Canada, until in 1998 [[Ashanti Goldfields]] [[Option contract|optioned]] the property and in 2005<ref>{{cite web |title=2005 Annual Report |url=https://www.aga-reports.com/05/annualreport05/report/pdf/ar_report_2005.pdf |publisher=AngloGold Ashanti Limited |access-date=30 January 2022 |location=Johannesburg |page=65 |date=28 February 2006}}</ref> [[AngloGold Ashanti]] established two small [[Open-pit mining|open pits]] to mine 500,230 tonnes of shallow oxide [[ore]] at a grade of 3.65 g/t gold to recover 58,696 [[Troy weight#Troy ounce (oz t)|troy ounces]]. The ore was trucked to AngloGold's plant at [[Obuasi Gold Mine|Obuasi]] for processing.<ref name=farrow/> Prior to mining AngloGold Ashanti's [[Mineral resource classification#Mineral reserves and ore reserves|mineral reserve estimate]] was 550,455 tonnes at a grade of 3.37 g/t gold, totaling 59,637 troy ounces.<ref name=smith/> |
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The project has a post-mining estimated [[Mineral resource classification#Mineral Resources|measured and indicated mineral resource]], dated December 2010, of 1.32 million tonnes of ore at a grade of 5.48 g/t containing 133,000 ounces of gold, below the old open pits. 2% of this resource was classified as "oxide". The remainder was classified as "fresh rock".<ref name=smith>{{cite web |last1=Meadows Smith |first1=Simon |last2=Amanor |first2=Joe |title=NI 43-101 Technical Report - Kubi Gold Project, Ashanti Region, Ghana, West Africa |url=https://www.sedar.com/GetFile.do?lang=EN&docClass=24&issuerNo=00032388&issuerType=03&projectNo=02267499&docId=3660450 |publisher=SEMS Exploration |access-date=24 January 2022 |location=Accra, Ghana |date=20 October 2014}}</ref> |
The project has a post-mining estimated [[Mineral resource classification#Mineral Resources|measured and indicated mineral resource]], dated December 2010, of 1.32 million tonnes of ore at a grade of 5.48 g/t containing 133,000 ounces of gold, below the old open pits. 2% of this resource was classified as "oxide". The remainder was classified as "fresh rock".<ref name=smith>{{cite web |last1=Meadows Smith |first1=Simon |last2=Amanor |first2=Joe |title=NI 43-101 Technical Report - Kubi Gold Project, Ashanti Region, Ghana, West Africa |url=https://www.sedar.com/GetFile.do?lang=EN&docClass=24&issuerNo=00032388&issuerType=03&projectNo=02267499&docId=3660450 |publisher=SEMS Exploration |access-date=24 January 2022 |location=Accra, Ghana |date=20 October 2014}}</ref> |
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Revision as of 18:29, 2 March 2022
| Location | |
|---|---|
  Kubi gold mine Location in Ghana | |
| Location | Dunkwa-on-Offin |
| Central Region | |
| Country | Ghana |
| Coordinates | 6°00′32.4″N 1°43′38.8″W / 6.009000°N 1.727444°W |
| Production | |
| Products | Gold |
| Production | 58,696 troy ounces |
| Financial year | Lifetime |
| History | |
| Opened | 2005 |
| Closed | 2005 |
| Owner | |
| Company | Asante Gold Corporation |
| Year of acquisition | 2014 |
The Kubi gold mine is an abandoned mine located 8 kilometres (5.0 mi) northeast of Dunkwa-on-Offin and 22 kilometres (14 mi) south of Obuasi, in Central Region, southern Ghana.[1] It is 180 kilometres (110 mi) northwest of the national capital, Accra.[2]
Geology
The regional geology is of thick steeply dipping sequences of metasediments, alternating with Proterozoic metavolcanic rocks, all part of the Birimian Supergroup, in northeast trending belts. The Kubi mine lies on the western margin of the Ashanti Gold Belt, at the Birimian-Tarwaian contact.[3]
The Kubi project gold mineralisation is contained in a north-northeast trending shear zone in metasediments. Gold occurs associated with 5–15% pyrite and pyrrhotite, and also as coarse gold in narrow quartz veins, in a garnetiferous alteration zone 1–15 metres thick adjacent to the Birimian-Tarwaian contact. Gold mineralisation also occurs in quartz veins that cross-cut the contact. The mineralised zone has a strike length of at least 2,000 metres (6,600 ft) and is open to below 700 metres (2,300 ft) depth.[2]
Project history
Kubi was explored by BHP from 1988 to 1994, who concentrated drilling in an area of pre-existing artisanal mining. Exploration was continued by Nevsun Resources of Canada, until in 1998 Ashanti Goldfields optioned the property and in 2005[4] AngloGold Ashanti established two small open pits to mine 500,230 tonnes of shallow oxide ore at a grade of 3.65 g/t gold to recover 58,696 troy ounces. The ore was trucked to AngloGold's plant at Obuasi for processing.[2] Prior to mining AngloGold Ashanti's mineral reserve estimate was 550,455 tonnes at a grade of 3.37 g/t gold, totaling 59,637 troy ounces.[3]
The project has a post-mining estimated measured and indicated mineral resource, dated December 2010, of 1.32 million tonnes of ore at a grade of 5.48 g/t containing 133,000 ounces of gold, below the old open pits. 2% of this resource was classified as "oxide". The remainder was classified as "fresh rock".[3]
Infilling and partial rehabilitation of the open pits was completed in 2005.[3]
In 2021 Mining Journal reported that Asante was planning to redevelop the mine,[5] which still has over 300,000 ounces of gold underground.[6]
References
- ^ Nzulu, Gabriel K.; Bakhit, Babak; Högberg, Hans; Hultman, Lars; Magnuson, Martin (September 2021). "Elucidating Pathfinding Elements from the Kubi Gold Mine in Ghana". Minerals. 11 (9): 912. doi:10.3390/min11090912. ISSN 2075-163X.
{{cite journal}}: CS1 maint: unflagged free DOI (link) - ^ a b c Farrow, David (August 2007). "Qualified Person's Report on the Kubi Project Mineral Assets" (PDF). Midrand, South Africa: Golder Associates Africa (Pty) Ltd. Retrieved 24 January 2022.
- ^ a b c d Meadows Smith, Simon; Amanor, Joe (20 October 2014). "NI 43-101 Technical Report - Kubi Gold Project, Ashanti Region, Ghana, West Africa". Accra, Ghana: SEMS Exploration. Retrieved 24 January 2022.
- ^ "2005 Annual Report" (PDF). Johannesburg: AngloGold Ashanti Limited. 28 February 2006. p. 65. Retrieved 30 January 2022.
- ^ "Asante outlines timeline for Bibiani restart". www.mining-journal.com. 9 November 2021. Retrieved 28 February 2022.
- ^ Ecofin, Agence. "Avec le rachat de Bibiani, Asante Gold prépare son entrée dans le cercle des producteurs d'or au Ghana". Agence Ecofin (in French). Retrieved 28 February 2022.
Further reading
- Kesse, G.O. (1985). Mineral and Rock Resources of Ghana (Hardcover). Rotterdam Boston Accord, MA: Taylor & Francis Group, A.A. Balkema Distributed in USA & Canada by A.A. Balkema Publishers. ISBN 9789061916222. ISBN 9061916224.