The ores consist both of alluvial pebbles and of extensive deposits in place.
"The Economic Aspect of Geology" by C. K. Leith
He could not quite make out how he had missed the signs of alluvial deposit.
"The One-Way Trail" by Ridgwell Cullum
Nevertheless, the hog, cat, horse, and ass, whose bones are found in the alluvial deposits, may have been domesticated.
"The Ethnology of the British Islands" by Robert Gordon Latham
Mining people call it an 'alluvial or flood deposit.
"The Boy With the U.S. Miners" by Francis Rolt-Wheeler
BURYING OF FOSSILS IN ALLUVIAL DEPOSITS AND IN CAVES.
"Principles of Geology" by Charles Lyell
As a matter of fact, they are an alluvial deposit spread out by the same flood waters.
"Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 8" by Various
So long as they last these easily accessible alluvial deposits will always be cheaper to work than the deep mines.
"The Romance of War Inventions" by Thomas W. Corbin
Quartz reefs and alluvial deposits are found in many parts of the country.
"The African Colony" by John Buchan
Alluvial, pertaining to the deposits of sand, clay, or gravel, made by river action.
"A Manual of the Antiquity of Man" by J. P. MacLean
No human remains have been found below those alluvial deposits which are now forming by rivers, lakes, and the ocean.
"The Religion of Geology and Its Connected Sciences" by Edward Hitchcock