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Exploration for porphyry copper deposits in Pakistan using digital processing of Landsat-1 dataRock-type classification by digital-computer processing of Landsat-1 multispectral scanner data has been used to select 23 prospecting targets in the Chagai District, Pakistan, five of which have proved to be large areas of hydrothermally altered porphyry containing pyrite. Empirical maximum and minimum apparent reflectance limits were selected for each multispectral scanner band in each rock type classified, and a relatively unrefined classification table was prepared. Where the values for all four bands fitted within the limits designated for a particular class, a symbol for the presumed rock type was printed by the computer at the appropriate location. Drainage channels, areas of mineralized quartz diorite, areas of pyrite-rich rock, and the approximate limit of propylitic alteration were very well delineated on the computer-generated map of the test area. The classification method was used to evaluate 2,100 sq km in the Mashki Chah region. The results of the experiment show that outcrops of hydrothermally altered and mineralized rock can be identified from Landsat-1 data under favorable conditions.
Document ID
19760040584
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Schmidt, R. G.
Date Acquired
August 8, 2013
Publication Date
February 1, 1976
Publication Information
Publication: U.S. Geological Survey
Subject Category
Earth Resources And Remote Sensing
Accession Number
76A23550
Distribution Limits
Public
Copyright
Other

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