placer alluvial deposit containing particles or larger pieces of gold or other minerals. portal an entrance to a tunnel, drift or adit in a mine. prospect an excavation undertaken in a search for ore. prospecting the search for mineral deposits suitable for mining.
Horse adit in the abandoned lead mine, Nenthead, County Durham, UK Access to a mine by adit has many advantages over the vertical access shafts used in shaft mining. Less energy is required to transport miners and heavy equipment into and out of the mine. It is also much easier to bring ore or coal out of the mine.
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Winston proposes to open the Upper Hyantha Portal, widening the adit to allow access by modern mining equipment. A new decline will then be driven 300 feet to the north to meet the Edna Trend. Once veins are encountered, mining crews will begin test mining, and gold bearing material will be sampled and shipped to a contract mill.
Adit An entrance to a mine, generally a horizontal tunnel. Alluvial or Bench Deposits An ancient river washed rock and gravel bar that may be thousands of feet from the nearest stream, creek, or river. Alluvial or bench deposits contain untapped potential for finding gold because such areas have never been worked before.