Abstract: The method for extraction of precious metals from leachable ores and forming a building materials which includes the steps of crushing a quantity of leachable ore into a powder of substantially uniform particle size, mixing with a quantity of a binding material and mixing with a leaching material. The materials are then formed into a masonry building construction article having at least one passage therein. A plurality of the masonry building construction articles are stacked with at least some of the passages disposed therein in generally parallel flow paths and a solvent is passed through the passages of the masonry building construction articles.

Abstract: Timed or regulated air bursts are employed to agitate and oxygenate leachable ores or other material containing valuable leachable elements in the presence of a leaching solution. The process provides a homogenous mixing of fines within the leaching solution thereby reducing channeling within the ore.

Abstract: Recording apparatus for "dubbing" (recording from one to the other) onto a customer's magnetic tape cartridge, selected audio and/or video recordings stored in the apparatus. The apparatus includes means for activating the apparatus, means for selecting the desired recordings, means for identifying and storing data representing the selected recordings for tabulating royalties accrued by playing the selected recordings, and magnetic tape cartridge receptacle, transport and recording means for the customer's cartridge. The record selection and recording means may be located directly on the record storage and playback machine or at a remote recording station.

Abstract: Recording apparatus for "dubbing" (recording from one to the other) onto a customer's magnetic tape cartridge, selected audio and/or video recordings stored in the apparatus. The apparatus includes means for activating the apparatus, means for selecting the desired recordings, means for identifying and storing data representing the selected recordings for tabulating royalties accrued by playing the selected recording, and magnetic tape cartridge receptacle, transport and recording means for the customer's cartridge. The record selection and recording means may be located directly on the record storage and playback machine or at a remote recording station.