Name and Location
Ghaghoo underground diamond mine, Botswana.

Client
Gem Diamonds, through its wholly owned company, Gem Diamonds Botswana.

On July 25, 2011, Gem Diamonds announced the name change for its wholly owned Gope Exploration Company to Gem Diamonds Botswana. Gope Exploration Company holds the mining licence for the Gope deposit, which has been renamed Ghaghoo diamond mine.

Project Description
Originally scoped as a six-million-tonne opencast mine, following the global financial crisis in 2008, Gem Diamonds’ board undertook to review all capital projects and decided to develop a small underground mine instead of a large-capital openpit operation.

Based on the revised plan, the Botswana government granted the company a 25-year mining licence at the end of 2010.

The Ghaghoo mine is being built as an underground mine in a phased manner to take advantage of the Ghaghoo diamond deposit, which comprises a 2.1-million-carat mineable reserve, with an average grade of 27.81 carats per hundred tonnes at an average diamond price of $267/ct.

The mine is situated near the south-eastern border of the Central Kalahari Game Reserve, a remote area characterised by arid conditions and difficult road conditions. From a mining perspective, and to minimise the capital spend on Phase 1 of the mine, an access decline was selected as the most cost-effective method of accessing the deposit, which lies under a sand overburden of about 80 m.

A build-up to a steady-state production rate of 60 000 t/m is planned for 2015. About 200 000 ct to 220 000 ct are expected to be extracted from 720 000 t/y of kimberlite.

Phase 1 of the project will confirm the grade, diamond prices and recovery processes, including the use of autogenous milling, which is expected to increase diamond liberation. Results from Phase 1 will underpin a study aimed at defining the way forward for mining at Ghaghoo.

Value
Phase 1 will cost an estimated $96-million to implement.

Duration
Gem Diamonds officially opened its new Ghaghoo diamond mine on September 5.

Commercial production will start in the second half of 2014.

Latest Developments
Gem Diamonds will sell the first 4 028 ct of diamonds recovered at its Ghaghoo mine in February 2015.

The sale of diamonds from the underground mine will be held in conjunction with the sale of diamonds recovered at Gem’s Letšeng mine, in Lesotho, to enable existing customers to participate.

Gem Diamonds has reported that development at Ghaghoo is progressing in four production tunnels within the kimberlite on Level 1. The final sealing of a fissure within the basalt country rock on Level 1, which led to a significant volume of water flowing into the mine, is in progress.

Key Contracts and Suppliers
Redpath South Africa (incline sand tunnel contract).

On Budget and on Time?
Phase 1 development at Ghaghoo has been achieved on time and within budget. The processing plant is being commissioned. The planned full production of 720 000 t/y of kimberlite for 2015 remains on track.

Contact Details for Project Information
Gem Diamonds Botswana, tel +267 3182 796 or fax +267 3182 795.
Gem Diamonds public and media relations Sherryn Tedder, tel +44 20 3043 0280 or email stedder@gemdiamonds.com.
Redpath South Africa COO Lawrence Schultz, tel +27 11 570 4300, fax +27 11 974 2075 or email Lawrence.schultz@redpathmining.co.za.