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Overview

Kloof is a mature high-yield operation, with a LoM extending to 2035.

The mine is situated in the Magisterial District of Randwest, some 60km west of Johannesburg in the Gauteng province of South Africa. Kloof is accessed via the N12 highway between Johannesburg and Potchefstroom, close to Westonaria.

The area’s topography is relatively flat and the vegetation is classified as Bankenveld, consisting mostly of grassland. Livestock farming predominates in the surrounding area.

Kloof is an established, shallow to ultra-deep-level gold mine. Kloof, in its current form, dates from April 2000 when the Venterspost (1939), Libanon (1945), Kloof (1968) and Leeudoorn (1993) mines were amalgamated. The current mine infrastructure consists of five producing shaft complexes that mine open ground and pillars (white areas) with the deepest operating level some 3,347m below surface (45 Level at 4 Shaft), and two gold processing plants. The principal mining takes place on the VCR, with the remainder made up from MVR, KR and Libanon Reef (LR).

In 2017, Kloof delivered another strong performance with underground production increasing by 8% to 14,826kg; 476,700oz (2016: 13,704kg, 440,600oz) and surface production by 7% to 1,606kg; 51,600oz (2016: 1,506kg, 48,400oz). Higher underground mining volumes resulted in an 8% increase in ore milled to 2.2Mt. Surface throughput increased by 34% to 3.6Mt, owing to the greater volumes of Venterspost surface material treated at the Ezulwini plant, post the closure of Cooke 4.

Locality plan

Kloof location

Key statistics

   2017 2016 201520142013
PRODUCTION      
Main developmentm14,25816,16717,89918,74319,331
Area mined000m²310278308305301
Tonnes milledMt5.84.74.04.74.2
Yieldg/t2.863.253.543.663.78
Gold produced/soldkg16,43215,21014,06817,03815,977
 000oz528489452548514
COSTS AND MARGINS      
Operating costsR/t1,0001,0801,201968971
– undergroundR/t2,3422,3002,2512,0611,982
– surfaceR/t183162161156146
Operating profitRm3,0833,8501,9143,0012,854
Operating margin%3543294041
Capital expenditureRm1,2331,3041,1301,2361,304
– sustainingRm210261226356460
– ore reserve developmentRm876913841880844
– projectsRm14713064  
Total cash costR/kg357,245340,762342,764271,282261,570
 US$/oz835722836780847
All-in costR/kg439,506435,609426,223352,624353,884
 US$/oz1,0279231,0401,0141,147
All-in cost margin%182692019

Hoisting and production capacities

Operating shaftOperational hoisting capacity (ktpm)Planned production (ktpm)*
Main10083
81515
35529
48272
73220

* Planned production is five-year hoisted average from 2018 onwards

Plant capacities

PlantDesign capacity (ktpm)Current operational capacity (ktpm)Average recovery factor (%)Material treated
1 (CIP)18018089.4Primarily SRD
2 (CIP)12016798.4Primarily UG