Abstract: A precious metal recovery system utilizing an amalgamation process which results in substantially complete recovery both of the precious metal sought and of the mercury utilized in the process. Mercury has undesirable health and environmental characteristics and the system of the invention assures its substantial containment. In the operation of the system, ore is classified and sorted out into a plurality of bins or holds containing ore having a substantially uniform particle size. The ore is then delivered, bin by bin, beginning with the smallest particle size, to apparatus which assures substantially complete amalgamation of all of the precious metal present in the ore. Thereafter, a resulting slurry of water and tails is first removed from the amalgamation apparatus and any residual mercury removed before its return to the environment.

Abstract: An air conditioning system has a freeze tank with a first coolant tank positioned therein with means for freezing a liquid in said freeze tank around said first coolant tank at a predetermined low temperature and cooling a specially prepared coolant as a liquid in the first coolant tank to the same low temperature; a second coolant tank contains a coolant connected to an evaporator coil in a duct means wherein flow from said second coolant tank through said evaporator coil provides for cooling air through said duct means when desired; heat absorber plates being located in said second coolant tank with means connecting said first coolant tank to said heat absorber plates for flowing the specially prepared coolant therethrough when desired.