| Title | Precious Metal Sampling at the Ohaaki Geothermal Field |
|---|---|
| Authors | K.L. Brown, J.G. Webster, B.W.Christenson |
| Year | 1997 |
| Conference | PNOC-EDC Geothermal Conference |
| Keywords | |
| Abstract | A special downhole sampler has been built to sample for the precious metals (copper, silver and gold) and the platinum group metals in deep geothermal reservoirs. During the February 1996 shutdown period, samples were collected from two wells at the Ohaaki geothermal field. The fluids were analyzed by quantitative ICPMS. In the deep geothermal reservoir, gold concentrations of 0.5 - 1.16ppb and silver concentrations of 5.7 -18.0 ppb were found. No detectable platinum group metals were detected. These results analyzed directly from the deep geothermal fluids agree with previous approximate estimates of the gold and silver concentrations from surface derived measurements. |