Omai 金矿区由中温脉金矿化和相关的腐泥土冲积砂矿组成,赋存于圭亚那地盾的古元古代花岗岩-绿岩地形中。总采矿储量估计为 4480 万吨,品位为 1.43 glt Au。该金矿区位于东南东向的区域规模结构上,称为 Issano-Appaparu 剪切带。在 Omai,金矿床位于两个独立的矿区 - Omai Stock 区和 Wenot Lake 区。大部分原生矿化集中在高 AI、石英闪长岩-长花岗岩凸起(Omai Stock)上,其中围岩蚀变以热液绢云母-碳酸盐组合为主。原生矿石包 Au-W-Te-S 矿化包含在一系列狭窄(1-5 厘米)的石英碳酸盐(铁白云石)脉中。可见金通常与方铅矿和微观碲化物有关。临时流体包裹体研究表明,母热液含 H 2 0-C0 2 (- 5.0 mol% CO 2 ),盐度低 (0-1.8 wt. % NaCI 当量),密度适中 (0.96 g/cm 3 )。流体的沉积温度可能在 200-400oC 左右。初步的 6'80 值与岩浆和/或变质源一致。
Ana Mendez and Rajeev Jayavant Bill and Sue Miklos Fund G & P Miller Feline Health Center Fund Mark Miller Miriam Miller Estate Diana Muller Gary A. Munoz Margaret Murphy Estate Maud and Burton Goldfield Family Foundation Myers Hunter Charitable Foundation Paul and Susan Nagata Joanne Nicholson Jennifer Nitrio NMS Property Services Corporation John Noll and Kathrin Stamp海伦·诺斯(Helen North-Root)博士Mrs. Muriel H. C. Ong Kim Ooi and Paul Neumeyer Kevin M. Ow-Wing Jerry Pacheco Jerold Pearson Fund Laurel Place Bill Porter and Kirsten Greene Jennifer Prieto Prometheus Life / Charles and Phyllis Newman Kevin Ray and Ronald Caple Roy E. Hanson Jr. Mfg.克莱尔·鲁道夫(Claire Rudolph