Narrow-vein mining experiences at the Ashanti mine: a case study

Symposium on Vein Deposits
Fidelis T. Suorineni, Peter K. Kaiser, John G. Henning,
Abstract The Ashanti mine, located in Obuasi, Ghana, West Africa, has been in production for over 100-years, and is currently the second largest single gold producer in Africa. The mine covers a concession area of 434 square kilometers with four main ore types: the quartz vein type, dissemintated sulphide type, supergene sulphides and transition ore, and granitoids stock works (visible gold and quartz veinlets).

Various mining strategies and methods have been employed for the mining of the narrow vein ore at Ashanti. In recent years, the mine owner: Ashanti Goldfields Company Ltd. has embarked on a mine-wide expansion program to boost production to a target of one million ounces per annum. With the rapid depletion of its high-grade ore, a suitable mining method was required to produce a high tonnage to meet production objectives.

This paper discusses how the Ashanti mine applied Canadian experiences in mining technology to boost its production, and the impact that the differing geological settings between the two countries had on stope performance at the Ashanti operations. Experience developed at the Ashanti mine led to innovative modifications for stope layout and design methods in relatively poor ground conditions.
Keywords: Ashanti mine, Stope design, narrow vein
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