TABLE 3-6. CONCENTRATIONS OF ARSENIC, COPPER, LEAD, AND ZINC IN THE COLORADO TAILINGS 

 SOURCE MATERIAL SAMPLE TYPE/LOCATION ARSENIC COPPER LEAD ZINC 



iEm} 



Duaime et at. Tailings Center field 

 1987* Series (13 holes) 



Tailings West field 



Series (7 holes) 



Tailings East field 



Series (8 holes) 



Thornell 1985 Tailings One drill hole Max 2,960 6,730 2,740 8,230 



(8 intervals) Min 678 663 480 2,430 



3,058 1,264 4,945 



Peat One drill hole Max 1,550 14,300 14,900 22,500 



(6 intervals) Min 504 1,730 6,370 13,800 



6,022 9,933 17,333 



Alluvium One sample from — — 188 28 300 

 a dri 1 1 hole 



Peckham 1979 Tailings 48 in auger hole 1,400 1,300 11,000 



24 in auger hole 500 470 3,700 



50 in auger hole 3,900 530 12,000 



Bohn et al. 1979 Natural Typical value 5 20 10 50 



soils Range 1-50 2-100 2-200 10-300 



* These samples were analyzed using metal assay techniques rather than digestion techniques. 



3-32b 



