More than thirty years ago,microprobe analysis introduced the possibility of analyzing quantitatively in situ small surfaces of polished sections ,redering obsolete many of the optical measurements and other data that had been presented in many standard ore-mineralogy textbooks,and thus a new approach to the subject was called for.in addition ,it sh…
Basement rocks are exposed on the wastern and northern flanks of the ombilin II study are,they consist of metasediments,limestone and granodiorite .these rocks from the source rocks for the sediments found in the ombilin basin.they range in age from permo-carboniforous to triassic.
Coal-rich Tertiary sediments of the ombilin II coal field,west sumatra occur within a structurally complex foult bounded graben formed as a resoult of subduction of the pacific plate beneath sumatra.tectonic activity associated with foult movement appears to have influenced the caracter of the coal seams.grouth foulting my be responsible for areas o…
This report represents a compilation based on data aequired froms jaarb .V/h mijnw.,the geology of indonesia ,stratigraphic lexioon of indonesia and other available report at the direktorat geology bandung ,especially on riau daratan until south sumatra ,central and southeast kalimantan and the southern part of west irian .
Dalam rangka usaha inventarisasi bahan galian pospat di Indonesia serta tinjauan tentang kemungkinan pemanfaatan dan poteris Lnya , maka disusunlah buku ini berdasarkan bebe• rapa laporan data basil penyelidikan lama maupun data yang baru.Batuan pospat terdiri dari mineral pospat yang kristal kristalnya tidak terlihat, mengandung trikalsium…
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Deskripsi Fisik
39 Halaman, tidak berwarna, cover biru, lampiran p
This chapter will deal with the policy is• sues relating to mineral land disposal. The first portion of the chapter will discuss in general terms the legal systems utilized in disposing of mineral rights and the major problems encountered; the second section will comprise an analysis of the policy alter•natives wit…
The recognition of the nature of primary and secondary dispersion halos and trains associated with mineral deposits. Although haloesand trains were known for centuries to be associated with metal deposits, the work carried out in the U.S.S.R and Scandinavia in the 1930's and early 1940's systematised the data and permitted it to be used in the most …
Hampir semua anomali magnit positip menempati kedudukan satuan babuan diorit, kecuali kearah utara dimana ditapsirkan satuan batuan ini mendekati batas litologi dari satuan batuan serpih yang tidak magnetis, anomali mas nit diatas satuan batuan diorit ini menjadi negatip. Anomali Potensial Diri selalu berasosiasi dengan anomali magnit…
Metallogenetic concept on mineral deposits of Indonesia as proposed by WESTERVELD is reviewed.
Depsite its general validity and practical applicability, certain geological phenomena and mineral occurrences seem to contradict the concept and therefore revisions are suggested A Metallic mineral distribution map with a scale 1:5000.000 accompanies thi…
Daerah Selogiri, yang terletak di Kabupaten Wonogiri, Jawa Tengah, adalah salah satu dari beberapa daerah pencarian emas di Daerah selatan Pegunungan di Jawa, Indonesia. Tiga jenis batuan intrusi dioritik-andesitik terjadi di daerah Selogiri, yaitu, porfiri andesit hornblende, porfirior hornblende diorite dan hornblende diorite, terekspos dalam depr…