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Bulyanhulu Mine in Tanzania is an underground gold mine. Tailings are pro-
duced and used in part for paste as underground backfill material. The balance of
the tailings is deposited on the surface as a paste. Research is currently underway
to determine the optimum method of deposition. The mechanical behaviour of
the tailings was assessed by means of a field monitoring program. Various soil
parameters such as gravimetric moisture content, suction pressure and, in-situ
density were measured for a period of approximately three months on a freshly
deposited beach. Measurements were taken at regular intervals between the dis-
charge point and the toe of the beach on a daily basis. The results of the field
monitoring program provided valuable information on the unsaturated soil
behaviour with particular reference to the air entry value and moisture retention
220 Paste 2005, Santiago, Chile
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