The operation you are thinking about was located close to Horse Thief Springs and was operated by the Standard Slag Company. The ore was mined, crushed and sorted on site. It was loaded onto trucks and delivered to the loading spot at the end of a siding at Cima. The trucks ran under the highway (I 15?) on the way to load and unload. the ore was sold to Japan and was shipped by boat, being loaded in the Long Beach area. I was involved in helping my Father in the tire related work generated by the equipment.