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Merelani Hills (Mererani), Lelatema Mts, Simanjiro District, Manyara Region, Tanzania

This page kindly sponsored by Peter Slootweg
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Entrance to the one of the poorest tanzanite mine of the block D (Mererani Area).

Merelani Hills, Lelatema Mts, Simanjiro District, Manyara Region, Tanzania
Awful climb-down to the - 400 m level of the one of the Merelani Area tanzanite mine. Without an elevator, oxygen and safety facilities it was a relatively dangerous activity.

Merelani Hills, Lelatema Mts, Simanjiro District, Manyara Region, Tanzania
One of the modern schafts of the Mererani tanzanite mines area

Merelani Hills, Lelatema Mts, Simanjiro District, Manyara Region, Tanzania
Entrance to the one of the poorest tanzanite mine of the block D (Mererani Area).

Merelani Hills, Lelatema Mts, Simanjiro District, Manyara Region, Tanzania
Awful climb-down to the - 400 m level of the one of the Merelani Area tanzanite mine. Without an elevator, oxygen and safety facilities it was a relatively dangerous activity.

Merelani Hills, Lelatema Mts, Simanjiro District, Manyara Region, Tanzania
One of the modern schafts of the Mererani tanzanite mines area

Merelani Hills, Lelatema Mts, Simanjiro District, Manyara Region, Tanzania
Entrance to the one of the poorest tanzanite mine of the block D (Mererani Area).

Merelani Hills, Lelatema Mts, Simanjiro District, Manyara Region, Tanzania
Awful climb-down to the - 400 m level of the one of the Merelani Area tanzanite mine. Without an elevator, oxygen and safety facilities it was a relatively dangerous activity.

Merelani Hills, Lelatema Mts, Simanjiro District, Manyara Region, Tanzania
Latitude & Longitude (WGS84): 3° 34' 59'' South , 37° 0' 29'' East
Latitude & Longitude (decimal): -3.58333,37.00833
GeoHash:G#: kz67d5sts
Locality type:Group of Hills
Köppen climate type:Aw : Tropical savanna, wet
Name(s) in local language(s):Merelani tanzanite mines (Mererani)


The Merelani tanzanite mines or Merelani Gem mining area is an area 2km wide and 50 km long. It's located in the Merelani Hills, on the slope of Lelatema Mountains (which actually are located politically-geographically in the Manyara Region, and not in the Arusha Region), about 70 km southeast of the town of Arusha (located in the Arusha Region), where tanzanite was first found in 1968.
Subdivided into four mining blocks (A, B, C, D) and additional mines.

The occurrence of gem-quality tanzanite and grossular has been found to occur mainly in boudinaged pegmatitic veins and hydrothermal fracture fillings. These fracture fillings occur in brecciated and hydrothermally altered graphite-bearing gneiss in a mineral association containing glass-clear quartz, diopside, zoisite, graphite and calcite.


Mineral List

Mineral list contains entries from the region specified including sub-localities

46 valid minerals. 2 (TL) - type locality of valid minerals.

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Pleistocene
0.0117 - 2.588 Ma



ID: 3188312
Cenozoic volcanic rocks

Age: Pleistocene (0.0117 - 2.588 Ma)

Lithology: Intermediate volcanic rocks; trachyte

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Cryogenian - Tonian
635 - 1000 Ma



ID: 3310707

Age: Neoproterozoic (635 - 1000 Ma)

Lithology: Volcanic-sedimentary

Reference: Thiéblemont, D. (ed.). New edition of the 1:10,000,000 geological map of Africa. CGMW-BRGM. [190]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License


Localities in this Region
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Tanzania

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Barot, N.R. and Boehm, E.W. (1992) Gem Quality Green Zoisite, Gems & Gemology: Spring 1992: 28(1).
Malisa, E.P.J. (2003) Trace elements characterization of the hydrothermally deposited tanzanite and green grossular in the Merelani-Laletema shear zone, northeastern Tanzania. Tanzania Journal of Science Vol. 29, pp 45-60.
Canadian Mineralogist (2008) 46: 1183-1194.
Olivier, Bernard (2008) The geology and petrology of the Merelani tanzanite deposit, NE Tanzania. Doctoral thesis, University of Stellenbosch, South Africa. [https://scholar.sun.ac.za/bitstream/handle/10019.1/1093/olivier-b-2008.pdf?sequence=3&isAllowed=y ]
Pardieu, Vincent and Hughes, Richard W. (2008- latest update 2014) Working the Blueseam: The Tanzanite Mines of Merelani. Ruby-sapphire.com
Wilson, W.E., Saul, J.M., Pardieu, V., and Hughes, R.W. (2009) Famous Mineral Localities. The Merelani Tanzanite Mines, Lelatema Mountains, Arusha Region, Tanzania. Mineralogical Record, 40: 347-408.
Jaszczak, J.A. and Trinchillo, D. (2013) Miracle at Merelani: A remarkable occurrence of graphite, diopside and associated minerals from the Karo Mine, Block D, Merelani Hills, Arusha Region, Tanzania. Rocks and Minerals, 88(2): 154-165.
Pohwat, P.W. (2013) Connoisseur's Choice: Diopside- Merelani, Arusha Region, Tanzania. Rocks and Minerals, 88(2): 166-173.
Americolo, F. (2013) Merelani (Mererani): A pictorial of an incredible place. Rocks and Minerals. 88(2): 174-177.
Long, J.M., Rakovan, J., Jaszczak, J.A., Sommer, A.J., and Anczkiewicz, R. (2013) Fluorapatite from a remarkable occurrence of graphite and associated minerals from the Karo Pit, Block D, Merelani Hills, Arusha Region, Tanzania. Rocks and Minerals, 88(2): 179-183.
Jaszczak, J.A. (2014) Mineralogical Miracles at Merelani. Presentation to the 41st Rochester Mineralogical Symposium, April 25, 2014.
Harris, C., Hlongwane, W., Gule, N., and Scheepers, R. (2014) Origin of Tanzanite and Associated Gemstone Mineralization at Merelani, Tanzania, South African Journal of Geology: 117: 15-30.
Harrison, S., Jaszczak, J.A., Keim, M., Rumsey, M., and Wise, M.A. (2014) Spectacular Sulfides from the Merelani Tanzanite Deposit, Manyara Region, Tanzania. Mineralogical Record: 45: 553-570.
Jaszczak, J.A., Rumsey, M.S., Bindi, L., Hackney, S.A., Wise, M.A., Stanley, C.J., and Spratt, J. (2016) Merelaniite, Mo4Pb4VSbS15, a New Molybdenum-Essential Member of the Cylindrite Group, from the Merelani Tanzanite Deposit, Lelatema Mountains, Manyara Region, Tanzania. Minerals: 6, 115. doi:10.3390/min6040115
Jaszczak, J.A. (2017) The Where of Mineral Names: Merelaniite, Merelani (Mererani), Manyara Region, Tanzania. Rocks and Minerals, 93: 382-385.

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