The towns of the Red River Valley, which are nearer to the great wheat belt, give promise of developing into great flouring cities.
Among the other manufactories are flouring and grist mills, planing mills, foundries, and factories for making agricultural implements, United States mail boxes, furniture, pianos, organs, automobiles, toys and electrical supplies.
One of the greatest difficulties in the treatment of gold by amalgamation, and more particularly in the treatment of pyrites, arises from the so-called " sickening " or " flouring " of the mercury; that is, the particles, losing their bright metallic surfaces, are no longer capable of coalescing with or taking up other metals.
It is also stated that sodium prevents both the " sickening " and the " flouring " of the mercury which is produced by certain associated minerals.
The addition of potassium cyanide has been suggested to assist the amalgamation and to prevent " flouring," but Skey has shown that its use is attended with loss of gold.