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Botswana
BK11 Mine

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 Location:
10 km SW from Letlhakane, Botswana

  Regional Office:
Black River Park South, Ground Floor, Old Warehouse Building, 2 Fir Street Observatory
Cape Town
South Africa
7925
Phone  ...  Subscription required
WebsiteWeb
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Overview

StatusCare and Maintenance
Mine TypeOpen Pit
Commodities
  • Diamond
Mining Method
  • Truck & Shovel / Loader
Processing
  • Crush & Screen plant
  • Dense media separation
Mine Life10 years (as of Jan 1, 2014)
On care and maintenance since February 2012
Latest NewsFirestone Diamonds plc: Sale of Botswana Operations     July 2, 2021


Owners

Source:
CompanyInterestOwnership
Firestone Diamonds plc 90 % Indirect
Firestone Diamonds controls 90%, with a group of local investors owning the remaining 10%.

2 July, 2021 - Firestone Diamonds plc is pleased to announce that it has entered into a binding share sale agreement (the “Agreement”) with Visionary Victor Resources Proprietary Limited (“Visionary Resources”) for the sale of its Botswana operations, including its interest in the BK11 mine.

Visionary Resources is a company registered in Botswana. Pursuant to the Agreement, Visionary Resources will acquire Firestone’s wholly-owned subsidiary Firestone Diamonds Botswana (PTY) Ltd and its 90 percent interest in Monak Ventures (PTY) Ltd, which holds Firestone’s interests in Botswana for a one-off upfront payment of US$50,000. In addition, Visionary Resources will assume the environmental liability currently associated with the BK 11 mine.

Subject to regulatory approvals within Botswana, the transaction is expected to be completed in the fourth quarter of 2021.

Deposit Type

  • Kimberlite


Summary:

The surface area of BK11 is presently modelled as 9.6Ha and overburden, consisting of Kalahari sands and calcretes, is relatively shallow at, on average less than, 4m. The overburden is underlain by intensely calcretised and silcretised low grade kimberlitic material up to a depth of approximately 20m.

A comprehensive exploratory drilling programme was undertaken to fully delineate the position, extent and morphology of the BK11 kimberlite pipe below the surface to a depth of approximately 150m, as well as to establish the mineral resource potential.

The BK11 kimberlite has been shown to be a classic “champagne glass” shaped pipe with a large crater bowl filled with layered volcaniclastic deposits (K2-K3) and talus slope deposits, commonly known as country rock breccia, closer to the crater walls. A rather less-well delineated “neck” of more massive volcaniclastic kimberlite (K4) and basalt breccia underlies the crater. The kimberlite is covered with a thin veneer of up to, on average, 4m of Kalahari sands and then gradational calcrete/silcrete units which are believed to be dominantly weathered K1 material. Several shaley kimberlite units are present in the upper pipe, dipping gently outwards from the K1 “knoll” in the centre of the pipe.

The western and central side of the kimberlite pipe at BK11 is characterised by a cleaner and subsequently higher grade kimberlite, containing a higher proportion of clear white crystals with very little boart. However the eastern side of the kimberlite pipe at BK11 is characterised by dirty, heavily diluted and therefore lower grade kimberlite.


Mining Methods

  • Truck & Shovel / Loader


Summary:

As the mining operations at BK11 were only active for a limited period of time, the kimberlite pipe was mined to a depth of approximately 60m. Due to its higher grade, mining operations focused initially on the Western Zone of the kimberlite pipe.

The mining operations at BK11, prior to the mine being placed on care and maintenance (in February 2012), consisted of ore being loaded from the open pit and/or existing stock piles by hydraulic excavators onto five 25t ADTs which then transported material to the BK11 Treatment Plant for processing and recovery of diamonds. An additional fleet of 6 ADTs was used for waste stripping and initial overburden removal. However as waste volumes increased a contractor was appointed to carry out the removal of waste rock. Drilling and blasting operations were also outsourced.


Crushing and Grinding
Flow Sheet: Source


Processing

  • Crush & Screen plant
  • Dense media separation

Flow Sheet: Subscription required



Reserves at November 26, 2009:

CategoryTonnage CommodityGradeContained carats
Indicated 2,320,849 t Diamond 10 cpht 239,543 carats
Inferred 27,490,836 t Diamond 3 cpht 958,066 carats


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Nov 25, 2020
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
Technical Report 2014
Subscription required - Subscription is required.

News:

NewsDate
Firestone Diamonds plc: Sale of Botswana Operations July 2, 2021

Subscription required - Subscription is required.

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