author: gerald francis loughlin

... washer , or inclined trough , in which was rotated a log 10 to 20 feet in length having metal paddles attached to its ... washers . The plant should be built if possible on a hillside lower than the ore deposit , to have the advantage of ...

... Isometric ; bright - yellow flakes ; on joint planes of jasperoid in oxidized ore ; rare . SILVER MINERALS . Native silver ( Ag ) . Isometric ; silver - white flakes or wires ; not common . Cerargyrite ( AgCl ) . Isometric ; brown or ...

... Esper Signius Larson. bal dever been very successful . Two types of lode ... free and also combined with the sulphides . The gangue is predominantly ... genesis of the ores is closely associated with the origin of the dies , as both ores ...

... CAVES In many places in the Pend Oreille Valley caves are found in carbonate rocks , generally along fractures or breccia zones . Probably the best known of these caves is the Gardner Cave , which is a State park in the east - central ...