An improved method of freeing iron stone and other metallic ores from shale has recently been invented by John Harding, of Leeds, England. In preparing some iron ores for the furnace, it has to be ...

Mason, for an improved method of desulphurizing and oxidizing metallic ores. Theplain tiffs alleged in the bill in this action that Hagan was the inven-torof theimpr-vementsclaimed in the reissue ...

The processes most often associated with processing of NORM with elevated concentrations of radioactive materials include mining and milling of metalliferous and non-metallic ores, production of coal, ...

Metal ores are naturally occurring rocks that contain metals or metal compounds in sufficient amounts to make it worthwhile extracting them. The method used to extract a given metal from its ore ...