Overview
Status | Care and Maintenance |
Mine Type | Underground |
Commodities |
|
Mining Method |
|
Production Start | ...  |
Matchless mine is part of the Central Operation, currently on care and maintenance. The mine was in production until September 2015, producing high quality concentrate sought after for blending.
No production data is publicly available since mine acquisition by Bonohgroup Limited. |
Source:
p. 9,10
Company | Interest | Ownership |
Bonohgroup Ltd.
|
100 %
|
Indirect
|
On 1 June 2018, Simon Kirkhope and Andrew Johnson were appointed as Joint Administrators of the Weatherly International plc.
Following no viable third party offers having been received and on the basis that a thorough marketing process had been run and a purchaser had not been found, the Administrators approved and accepted an offer received by Bonohgroup Limited, whose Director, John Sisay, is a person connected with Weatherly International PLC (“the Company”), to purchase the shares the Company held in WNSL, CARN and CARN Holding. CARN which held Berg Aukus and Weatherly (Namibia SL) LTD (St Lucia) “WNSL” which through Ongopolo Mining Ltd (Namibia) “OML” held the Tschudi mine, Central operations and the Tsumeb township and concentrator.
Exchange of contracts took place on 28 July 2020, following this on 2 September 2020 the share sale was completed and the shares in the Company’s subsidiaries were sold to Bonohgroup Limited (is a private company).
Contractors
- Subscription is required.
Summary:
The Matchless Amphibolite Belt is a conspicuous narrow northeast-southwest trending sequence consisting of amphibolite, chlorite-amphibole schist, talc schist and metagabbro which extends over a distance of 350km in the Southern Tectonostratigraphic Zone of the Damara Orogen. The Matchless Belt represents a sequence of metamorphosed tholeiitic basalts, which are the product of submarine volcanism. Stratigraphically the Matchless Amphibolite Member occurs within the Kuiseb Formation (Khomas Subgroup) of the Damara Sequence, which is a metapelitic sequence of biotite schists, with subordinate calcsilicate rocks and carbonaceous schists.
The Matchless deposit comprises six echelon shoots namely the Eastern Prospect, East Shoot, West Shoot, River Shoot, Western Prospect and Western Extension, extending over a strike length of 2.5km from the east to the west in that order (Fig.3.3.1_1). The East Shoot, West Shoot and River Shoot form the old Matchless Mine. The mineralisation occurs in amphibolites and quartz-sericite schist lying between the Matchless Amphibolite and the Footwall Amphibolite, dipping at 30o , 350o towards the north and plunges to the northwest. The mineralised zones are distinct pyrite chalcopyrite occurring in a quartz mica schist. A slight angular discordance between the mineralised zone and the Matchless Amphibolite was mapped on outcrop. The mineralisation is strata-bound and is of a massive sulphide type containing mainly pyrite, pyrrhotite, chalc ........

Summary:
A shoot called Matchless Western Extension, some 1,800m west of the old Matchless mine, was being mined by means of a decline that reached 11 Level. The shoot has a steep plunge to the northwest and the deposit dips at 35° to 45° which requires the decline to progress rapidly down dip.
Previously, the Matchless mine was operated successfully by a mining contractor using a cut and fill mining method. The planned mining method is a cut and fill method utilising 3.0m high lifts.
Flow Sheet:
Ore from the Otjihase mine will be crushed underground through a jaw crusher to a nominal 150mm prior to being transported to surface, to a 3,200t receiving bin at the plant. Ore from Matchless mine is road hauled and similarly crushed at Otjihase ahead of the same receiving bin. The receiving bin has 14 off take points feeding a single conveyor.
The different ore types are stored separately in the receiving bin with no mention or plan of blending practice. The ore ratio is expected to be 35,000t:15,000t Otjihase: Matchless, and some consideration may be given to blending is based on the flotation response and the quantity of ores available.
The crusher plant consists of a primary grizzly with oversize being crushed in the 5½ft Standard Symons secondary crusher. The grizzly fines are screened on a vibrating screen to reduce the load on the tertiary crusher. The screen oversize and the secondary crusher product are conveyed to a surge bin then to the tertiary screen and tertiary crusher, a 5½ft Shorthead Symons. The screen undersize is directed to three fine ore silos whilst the screen oversize is crushed in the tertiary crusher and recycled back to the screens where the fines are removed. This is a very conventional crusher circuit. The final crusher product size will nominally be 100% passing 10mm.
Crushed product is conveyed to three mill feed silos each with 1,100t capacity. Crusher plant spares observed include mantles, bowls and screen parts. The condition of this circuit is considered to be reasonable but some maintenance and checking is necessary before commissioning. The dust extraction system at the crusher plant should be checked prior to the planned start-up, particularly all ducting.
Milling plant
The milling circuit consists of three closed circuits Vecor 10ft x 12ft ball mills with 20” hydrocyclones. Mill motors are 670Kw with 11Kv supply. Historically the grind was approximately 80% passing 250 micron. The milling circuit configuration is very conventional, and considered suitable for the type of ore to be processed. The three old Ramsey weightometers measuring mill feed tonnages will be replaced with new process control units which may be configured to give some degree of automation and control.
The ball mills operate with rubber liners and lifters with 56mm plus 64mm cylpebs as grinding media. While the mills have not been run over the past year, barring gear units have been used to turn the mills to ensure that bearings and lubrication are functional. As with other parts of the plant, all equipment should be checked, cleaned and motors turned before startup.
Flow Sheet:
Summary:

- subscription is required.
Reserves at December 31, 2014:
Cut-off at 1% Cu
Category | Tonnage | Commodity | Grade | Contained Metal |
Proven & Probable
|
289,190 t
|
Copper
|
1.83 %
|
5,295 t
|
Indicated
|
280,224 t
|
Copper
|
3.14 %
|
8,796 t
|
Inferred
|
230,460 t
|
Copper
|
2.32 %
|
5,346 t
|
- Subscription is required.
Corporate Filings & Presentations:
- Subscription is required.
- Subscription is required.