Mineralogical, chemical and solubility variations in the Eppawala phosphate deposit of Sri Lanka ? a case for selective mining for fertilizers

Dahanayake K and Subasinghe SMND (1989a) A modern terrestrial phosphorite ? an example from Sri Lanka. Sediment Geol 61: 311?316

Jayawardena DEdeS (1976) The Eppawala carbonatite complex. Geological Survey Department publication, Colombo, Sri Lanka

Jayawardena D (1989) Characterization of Eppawala rock phosphate for manufacture of phosphatic fertilizer, Proc. National Symposium on ?The Eppawala phospherite deposit ? Recent Advances in knowledge?, Kandy, Sri Lanka, 10?11

Amerasekera J, Sooriyakumaran R and Ismail MGMU (1981) Preliminary laboratory studies on Eppawala apatite. J National Science Council of Sri Lanka 9(1): 55?76

Amerasekera J and Ismail MGMU (1983) Preliminary Laboratory Studies on Eppawala apatite ? II. J National Science Council of Sri Lanka 11(2): 211?224

Gunawardane RP (1987) Studies on complete and partial acidulation of Eppawala apatite. J National Science Council of Sri Lanka 15(2): 183?200

Tennakoon K (1988) Production of ammonium phosphate containing fertilizers from apatite unsuitable for the wet process. Fertilizer Research 17: 97?100

Tennakone K, Weerasooriya SVR, Jayatissa PL, Damayanthi, MLWD and Silva LHK (1988) Non hygroscopic superphosphate fertilizer from apatite and hydrochloric acid. Fertilizer Research 16: 87?96

Tazaki K, Fyfe WS and Dissanayake CB (1987) Weathering of apatite under extreme condition of leaching. Chem Geol 60: 151?162

Dahanayake K and Subasinghe SMND (1988) Development of recent stromatolitic structures and phosphatic enrichment in Precambrian marble of Sri Lanka, Economic Geology 83: 1468?1474

Dahanayake K and Subasinghe SMND (1989) Secondary phosphate mineralization in a karstic environment in central Sri Lanka. Mineral Deposita 24: 169?175

Dahanayake K and Subasinghe SMND (1990) Formation of phosphatic coated grains and peloids by grain diminution of Precambrian apatite crystals. J Geol Soc India 35: 189?197