Tanzania · Gemstone / Mineral / Mining
Mererani (the correct spelling of the district name, though 'Merelani' is the more common gem-industry spelling)
The hand-digging, shaft-mining, and grading of tanzanite -- the violet-blue variety of the mineral zoisite -- by artisanal miners of Merelani, a narrow strip of land roughly seven by two kilometers in the Manyara Region of northern Tanzania, situated at the foot of Mount Kilimanjaro and the sole commercial source of this gemstone anywhere on Earth. First discovered in January 1967 -- with conflicting historical accounts crediting either a local prospector, Ndugu Jumanne Ngoma, who directly described stumbling upon shimmering blue crystals lying on the ground while walking to visit relatives near Kiteto, or Manuel de Souza, credited by contemporary 1969 international press coverage including Time and Life magazines -- the gem's now-famous name was coined by American jeweler Tiffany & Co., which recognized its market potential and drove its rapid rise to global desirability. What began as simple surface collection quickly progressed to pits and eventually tunnels extending hundreds of meters underground; small-scale artisanal miners still work almost entirely with simple tools and ropes, manually digging shafts and tunnels into the hills, occasionally passing through harder rock formations using explosives, generally without safety equipment such as emergency oxygen supply. Extracted stones are cleaned, sorted, and graded by weight (carat), clarity, and color, with no official industry grading standard and the finest examples showing deep royal blue or violet hues; the extraction process is directly described by specialist gemological journalists as beginning with brute force but ending with the utmost care to avoid damaging the gems. By 1989, an estimated 30,000 artisanal miners were working the deposit following the Tanzanian government's 1986 abandonment of centralized management efforts; the resource has since been organized into four licensed mining blocks (A through D), with Block C -- the largest, most mechanized, and safest -- held for many years by TanzaniteOne and successor companies, while Blocks A, B, and D continue to support a mix of smaller cooperatives and artisanal operations.
Risk level: Endangered · Not independently inscribed
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