David Tilley
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Deposit Types
Epithermal Gold Deposits
Epithermal gold deposits are among the richest gold deposits in the world, with some bonanza-grade ore shoots containing more than…
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Important Mining Districts
Gold Deposits of New Zealand
Gold was one of New Zealand’s first industries. What is less known, and somewhat at odds with the country’s “clean…
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Commodities
Rare Earth Elements
There are 17 rare earth elements or REE for short. They include the 15 lanthanides, plus scandium (Sc) and yttrium…
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Deposit Types
Lateritic Bauxite Deposits – Our Largest Source of Aluminum
Laterite is formed when heavy tropical rainfall results in intense weathering of rock and soil. After many millions of years what…
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Drilling
Reverse Circulation (RC) Drilling
Reverse circulation or RC drilling is a fast and inexpensive method of drilling, particularly compared to diamond drilling. A hundred…
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East Manhattan Wash Gold Project, Nevada
Overview The East Manhattan Wash Gold Project is a low grade high tonnage placer style gold-silver deposit. This area of wash is…
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Exploration Geophysics
Airborne Geophysical Methods
There are a number of airborne geophysical methods used within the minerals exploration industry. Some of the most commonly used ones…
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San Jose Mine, Mexico
Overview The San Jose Mine is located in the Taviche Mining District, Oaxaca, Mexico. The mineralization at San Jose is mainly silver…
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Exploration Geophysics
Resistivity and Induced Polarisation Surveys
Resistivity Method – The Basics Without going into the physics of Ohm’s law, if you run a current through different…
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Exploration Geophysics
Exploration using telluric currents – MT and CSAMT
Magnetotellurics (MT) It sounds a like something from science fiction but magnetotellurics (MT) is just a fancy name for an…
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