The probable hypotheses of arsenic contamination in groundwater, like the oxidation of Arsenopyrite
and Pyrites and the reduction of Iron Oxyhydroxides, explain the arsenic contamination problem in Bangladesh well.
The secondary coating extends several microns from the arsenopyrite
grain boundary (Fig.
Liberation of arsenopyrite
ranges from 14% to 18% to 60% for grains sizes of 226 ?
The drill hole encountered quartz carbonate veins with arsenopyrite
and pyrite, and the distinctive sericite alteration of the Ben Vein zone was encountered at 114.
0x20 A channel sample from an adjacent outcrop with arsenopyrite
veinlets in shale returned a value of 4.
The drill hole encountered vein material with arsenopyrite
and pyrite from 87 to 104 meters.
Multiple zones of disseminated to massive arsenopyrite
, galena, sphalerite, pyrite, and pyrrhotite mineralization within fractured and intensely silicified sediments, chert, and calc-silicate skarn horizons have been identified on the Galaxy block and appear to be associated with a northwest oriented structural corridor that forms a 4km trend of mineralization that is open in all directions.
A 2 m wide zone in a trench located 120 m away contained disseminated arsenopyrite
in shale and samples from this area contained gold values of 3.
The Company will be running induced polarization studies on the northern arsenopyrite
Very strong gold-arsenic soil anomalies were identified in the northern portion of the 2008 grid and several impressive arsenopyrite
occurrences have been identified and sampled in this year's follow-up program.
Some surface sampling results are as follows: -- A continuous chip sample garnetite skarn with 2% arsenopyrite
Visible gold is common in most holes associated with quartz veins/microveins in close proximity to higher arsenopyrite
Gold mineralization in the 'Vardy-Homestake Zone' occurs with silicified sections containing fine-disseminated pyrite, arsenopyrite
The middle of the three holes (W06-17) intersected a zone of disseminated pyrrhotite and arsenopyrite
over a true width of 7.
Mineralization associated with the Thor and Hobo showings include molybdenite, chalcopyrite, galena, arsenopyrite
, scheelite, wolframite, and cassiterite.