P AGE 32 Selective Extractions Selective Extractions SE are a costef fective method of finding blind mineralization through deep cover such as exotic over burden lake beds barren bedrock or younger volcanic rocks V ery subtle trace element signatures have been added to soil above mineralization by elements migrating to the surface through a variety of mechanisms Some traps for these signatures include Mn oxides clay carbonates and organic material V arieties of Selective Extractions target dif ferent trap types to release the signal of mineralization A weaker leach is required to isolate the signal of blind min eralization from that of the over burden Conventional partial leaches like aqua regia extractionICP extract metals from sulphides oxides and silicates This provides a partial composition of the over burden which will contaminate the signal of the buried mineralization Pattern recognition is the key to proper interpretation of SE data since anomaly patterns can be dif ferent from conventional geo chemical data Selective extractions have been shown to work ef fectively in both acidic and alkaline environments and have been used successfully in desert tropical glacial and permafrost terrains Enzyme Selective Extraction ESE is one of the most discriminating of the selective analytical extractions in use today This selective extraction targets amorphous mixed oxide coatings By se lectively removing the amorphous manganese dioxide from these coatings the mixed oxide coatings collapse releasing trapped trace elements At this time the greatest depth of penetration of ESE for a mineral deposit is greater than 800 metres Bioleach uses technology proprietary to Actlabs Through years of research by Actlabs supported by CAMIRO Canadian Mineral Research Organization with our SGH technology Actlabs has proven that microbiological processes are exceptionally important for the mobilization of metals from a mineral deposit to the surface Redox cells develop above mineralization which bacteria then feed upon Bioleach digests remnant proteins that these bacteria have left behind when they die These proteins contain elements related to concealed mineral deposits The proteins migrate upwards and become adsorbed on soil particles and can then be digested by Bioleach MIG Mobile Ion Geochemistry isolates the chemically active metal ions which were loosely ad sorbed to soil particles This is a weak leach that uses a solution of organic and inorganic compounds to extract target elements Preparation and Analysis The recommended sample material is upper Bhorizon soil sampled at a continuous depth After materials are collected they are air dried or dried in special rooms kept below 40C Samples then undergo the chosen SE under rigidly controlled conditions The resultant solutions are analyzed by ICPMS Addons Final pH of leach solution 800 Conductivity of leach solution 800 pH and conductivity 1250 Prewash if required on high salt samples 300 SemiQuantitative 7ESE 7EnhESE 7SaltESE Enzyme Enhanced High SE Enzyme Salt SE Samples Ag 02 01 02 Al 05ppm 05 ppm 05 ppm As 1 01 5 Au 005 0005 01 Ba 1 05 1 Be 2 01 20 Bi 08 05 1 Br 5 1 30 Ca 5 ppm 5 ppm 05 ppm Cd 02 01 02 Ce 01 001 1 Cl 2000 1000 3000 Co 1 02 1 Cr 20 3 50 Cs 01 001 1 Cu 3 1 5 Dy 01 001 1 Er 01 001 1 Eu 01 001 1 Fe 1 ppm 1 ppm 1 ppm Ga 1 03 1 Gd 01 001 1 Ge 05 005 1 Hf 01 001 1 Hg 1 01 1 Ho 01 001 1 I 2 1 10 In 01 001 02 K 5 ppm 5 ppm 5 ppm La 01 001 1 Li 2 05 10 Lu 01 001 1 Mg 2 ppm 2 ppm 2 ppm Mn 1 04 10 Mo 1 01 1 Na 5 ppm 5 ppm Nb 1 01 1 Nd 01 001 1 Ni 3 1 5 Os 1 05 1 Pb 1 01 1 Pr 01 001 1 Pt 1 05 1 Pd 1 05 1 Rb 1 01 1 Re 001 0005 01 Ru 1 05 1 Sb 01 001 1 Sc 100 10 1000 Se 5 1 30 Sm 01 001 1 Sn 08 02 1 Sr 1 01 1 T a 01 002 1 Tb 01 001 1 T e 1 05 1 Th 01 001 1 T i 100 10 1000 Tl 01 0005 1 Tm 01 001 1 U 01 001 1 V 1 01 5 W 1 01 1 Y 05 005 1 Yb 01 001 1 Zn 10 5 10 Zr 1 01 1 Price 3200 4000 4000 7 Bioleach 02 05 ppm 05 005 1 007 01 5 5 ppm 005 002 01 2 001 05 001 001 001 1 ppm 01 003 005 004 005 001 1 01 5 ppm 001 02 001 2 ppm 01 2 02 003 02 1 01 001 05 05 01 001 005 02 05 1 003 01 001 001 1 002 02 001 001 1 001 002 002 2 05 2900 7 MIG Mobile Ion Geochem istry 02 05 ppm 05 005 1 007 01 5 05 ppm 005 002 01 2 001 05 001 001 001 1 ppm 01 003 005 004 005 001 1 01 5 ppm 001 02 001 2 ppm 01 2 02 003 02 1 01 001 05 05 01 001 005 02 05 1 003 01 001 001 1 002 02 001 001 1 001 002 002 2 05 2900 All elements are in ppb except where noted