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Table 4 Cassiterite reserve in Nigeria from 1972 to 1977 (metric tonnes)

From: Benefits of cassiterite mining by artisanal miners in Jos Plateau, Nigeria

Company

1972

1973

1974

1975

1976

1977

Latest reserve position

ATMNLTD.

44,436

45,172

49,165

48,165

48,840

49,313

31 March 1978

Ex-lands Nig.Ltd.

3283

2964

2969

2722

3054

2953

2953, 31 December 1977

Kaduna Prospecting Nig.Ltd.

2300

2330

2820

3083

3087

2596

3004, 31 December 1977

Gold and Base Metal Mines of Nig.Ltd.

2292

2190

2291

2269

2510

2260

2260, 31 December 1977

Bisichi-JentarNig.Ltd.

11,638

11,638, 31 December 1977