Copper assays of oak and mesquite leaves and the soil derived from them were made from trees growing over the Ray orebody and vicinity. Results show a marked increase of copper in plants and soil over the orebody as compared with samples taken from areas beyond the limits of mineralization. The copper content of trees growing in the stream bed below the orebody was lower than expected. Soil assays are affected by type of rock, drainage and extent of leaching. High erroneous assays are found in regions contaminated by smelter smoke.

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