The phosphate resources of Indalesia oonsist of nurrerous cave deposits of phosphatic guano and phosphatized lim=stone. depositso-J11tainup to 40% P2o5, but all of them are nto found in sufficient qu• ar-1tities to permi.t, than small-scale exploitation. There are no rrarine i;:h)sphorites found in this country, except sore thin layers of a few qn thick containing phosphate ccncretions occur in Pretertiary rocks of Luk Ulo (Central Jawa), Tinor and Misool island. ,

The phosphate demands to feed the fertilizer plant o~ JCstro• kirni.aGresik (Gresik Petrochemical Industry Co.) in 1985 was about, 800 thousand tens i:er year. It_is exclu::ied the danands for natural ferti-.lizer and fertilizer plant of PI' Pup.ik Iskandarrruda (Iskandarmuda Fer- tilizer Co.) in Aceh, as well as for other chemical industries apply- ing phosphates. Recently Indonesia has had to Import; rmre than 1 milli- en• tons of phosphate rocks per year to fulfil cbrrestic uses.

Exploration of phosphate deposits began in 1919 in Indonesia. La- tc~ this activity was intensively done when the governrrent's five years_plan was declared, in which the agriculture sector was decided as the nain taroet , Recently the Directorate of Mineral Resources (fonrerly tire Geological SUrveyof Ind::>nesia) is still continuing exploraticn

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