The South Reef footwall is a light coloured and fairly siliceous quartzite. Secondary conglomerate bands and stringers in the hanging wall and footwall of the South Reef may contain sporadic gold values. The general strike of the reef is east-west with a flat dip from 5 to 15 degrees. Exploration drilling is set to continue in the coming financial year, and will target potential high-grade areas and those with limited geological information, to further increase geological confidence.
Conventional narrow-reef mining Longwall. Doornkop is a single-shaft operation currently exploiting the South Reef to some m below surface. The narrow South Reef is exploited by means of conventional stoping.
Mining of the Kimberley Reef was suspended during FY14 to focus on the build-up of production from the South Reef and to prevent losses as a result of the lower gold price. Mining of the Kimberley Reef may resume should economic circumstances improve sufficiently.
The mining method used is longwall mining with stability pillars on major geological structures. The flat dip, which results in the development of long cross cuts, presents challenges in terms of ore handling, especially for the bottom part of the raises, ventilation and in the long lead times between the start of cross cut development to completion of stoping per raise line.
The gold plant consists of a milling section for grinding of ore, thickeners for dewatering pulp for leach feed , a leach section for dissolution of gold, using liquid sodium cyanide as one of the reagents, Carbon in Pulp for adsorption of dissolved gold and a recovery section which consists of elution, electro-wining and a smelt house. All tailings are pumped to a Tailings Storage Facility, adjacent to the plant on the northern side. The Doornkop TSF consists of one active compartment which is raised in the upstream direction.
The residue is deposited hydraulically by means of ring feed pipeline to open ended pipe deposition points along the day wall, pool wall including the wing walls both sides of the penstock and into the basin. All supernatant and storm water is decanted off the deposits through a gravity penstock that discharges into a canal draining to the return water dam located east of the TSF.
From the return water dam, the water is pumped back to the plant for reuse. Production :. Data Access UserName is required. Password is required. Keep me signed in. Forgot Your Password? Enter the email you signed up with and we'll email it to you. User Name is required. Doornkop Mine. This page is not tailored to devices with screen width under px. Box 2 Randfontein South Africa Major Infrastructure and Equipment : The design of the mine has been based on conventional mining methods, proven technology and established blasting techniques, resulting in a tramming width of cm and an average stoping width of cm.
Prospects : The Doornkop South reef project will entail the three-phase deepening of the Doornkop main shaft to 1 m, to access the South reef. It is estimated that the South reef project has an in situ resource of 5. The estimated capital cost of the project is R1. Name : Doornkop mine.
Products : Gold. Mining Method: Underground. Outlook for FY21 Achieving planned development targets to enable the life-of-mine production build up and to enhance mining flexibility will remain the priorities for FY Workforce 3 3 permanent employees and contractors.
Gold produced 2 kg FY 3 kg. Lost time injury frequency rate 6.
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