Gemstone district
Merelani Tanzanite Mining Area
The Merelani/Mererani/Mirerani mining area in Simanjiro District, Manyara Region, is the commercial source of Tanzanite.
Evidence-backed overview
The place, clearly defined
The Merelani/Mererani/Mirerani mining area in Simanjiro District, Manyara Region, is the commercial source of Tanzanite.
Geological context
How the occurrence is understood
The Merelani/Mererani/Mirerani mining area in Simanjiro District, Manyara Region, is the commercial source of Tanzanite.
Bidirectional relationships
Documented gemstones
Occurrence and production are separate claims. A production label is date-bounded and does not guarantee quality, origin determination, or market value.
Tanzanite
Recent, date-bounded evidence documents active production. This status requires periodic review.
Official Tanzanian Economic Survey 2024 documents national Tanzanite output; this does not assert continuous activity in every mining block.
Evidence ledger
Sources & verification
Sources are deduplicated across the geographic record. Current-production claims receive explicit review dates; a map point never substitutes for geological or production evidence.
- [1]Economic Survey 2024.
United Republic of Tanzania, Ministry of Finance · 2025
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