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

This page kindly sponsored by Peter Slootweg
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
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

Quaternary
0 - 2.588 Ma



ID: 1376522
Quaternary sedimentary rocks

Age: Pleistocene (0 - 2.588 Ma)

Lithology: Sedimentary rocks

Reference: Geological Survey of Canada. Generalized geological map of the world and linked databases. doi:10.4095/195142. Open File 2915d. [18]

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


Localities in this Region

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

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. & Hughes R.W. (2009) Famous Mineral Localities. The Merelani Tanzanite Mines, Lelatema Mountains, Arusha Region, Tanzania. Mineralogical Record, 40: 347-408.

Rocks and Minerals (2013) 88(2): 154-165.

Rocks and Minerals (2013) 88(2): 166-173.

Rocks and Minerals (2013) 88(2): 174-177.

Rocks and Minerals (2013) 88(2): 179-183.

Jaszczak, John A. (2014) Mineralogical Miracles at Merelani. Presentation to the 41st Rochester Mineralogical Symposium, April 25, 2014.

Harris, C., W. Hlongwane, N. Gule, and R. Scheepers (2014) Origin of Tanzanite and Associated Gemstone Mineralization at Merelani, Tanzania, South African Journal of Geology: 117: 15-30.

S. Harrison, J. A. Jaszczak, M. Keim, M. Rumsey, and M. A. Wise (2014) Spectacular Sulfides from the Merelani Tanzanite Deposit, Manyara Region, Tanzania. Mineralogical Record: 45: 553-570.

Jaszczak, J., Rumsey, M.S., Bindi, L., Hackney, S.A., Wise, M.A., Stanley, C.J. & 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

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