Here from the new CostMine 2012 Survey of African Mine Salaries are some figures for those working on mines in the Democratic Republic of the Congo — the first set of numbers are the range of salaries, the second is the average, and the third is the number of years of experience of those reporting salaries.
Artisan 21,600–30,000 24,900
Plant Supervisor 96,000–145,000 114,200 7–20
Surveyors 132,000–160,000 144,000 5–10
Laboratory Manager 54,000–72,000 63,000 5–10
Exploration Geologist 34,020–60,000 49,300 1–15
Engineer 108,000–168,000 133,200 5–20
Exploration Manager 120,000–200,000 158,500 20–25
I know not what to comment other than to note this also from the Survey:
The end of the war in 1999 led to a resurgence of the mining industry, which accounts for most of the DRC’s exports. Diamonds, copper, and cobalt are the dominant minerals. Artisanal and small-scale miners accounted for most of the Congolese output of diamond, gold, niobium, tantalum, tin, and tungsten. These miners also played a significant role in the country’s cobalt mine production. It is estimated that 2 million people work as artisanal miners across the country.