High-grade (> 10 g/t) gold mineralization in orogenic gold deposits is of significant economic importance. Understanding the formation of such enriched ore zones is critical for gold exploration success. The world-class Jundee-Bogada gold camp in the Yilgarn Craton of Western Australia comprises both high-grade (avg. > 10 g/t, Jundee deposit) and low-grade (avg. < 3 g/t, Bogada prospect) lodes, despite shared host stratigraphy. The paragenetic framework established for the Jundee gold deposit suggests that the overall gold endowment developed over three deformation events. An early episode of low-grade gold mineralization is associated with colloform-crustiform veins that formed during extensional deformation (D_JB2A). A switch to transtensional deformation (D_JB2B) resulted in brecciation of the colloform-crustiform veins and coeval deposition of native gold. Late reverse faults record evidence for a third mineralization stage resulting from a NE-SW-directed shortening (D_JB3). Mineralization during this late stage was dominantly low-grade, with local occurrences of ultra-high-grade ore zones (> 100 g/t). Each event records transient changes in fluid chemistry during continued hydrothermal activity that spanned local deformation histories. We argue that at the Jundee gold deposit, protracted gold enrichment during three polyphased mineralization episodes resulted in the formation of high-grade gold ores. Whereas the complete metallogenic history is recorded at the Jundee deposit, gold within the Bogada prospect was introduced solely during the late contractional stage (D_JB3), resulting in a bulk low-grade endowment. We hypothesize that gold enrichment in high-grade orogenic gold deposits is a direct consequence of the spatial superimposition of protracted ore-forming events.

造山金矿床中的高品位（> 10 克/吨）金矿化具有重要的经济意义。了解此类富矿带的形成对于黄金勘探的成功至关重要。位于西澳大利亚 Yilgarn Craton 的世界级 Jundee-Bogada 金矿区包括高品位（平均 > 10 克/吨，Jundee 矿床）和低品位（平均 < 3 克/吨，Bogada 矿床）矿脉，尽管有共同的宿主地层。为 Jundee 金矿建立的共生框架表明，总体金矿禀赋是在三个变形事件中形成的。低品位金矿化的早期阶段与伸展变形过程中形成的胶体-壳状矿脉有关 (D _JB2A )。转向张拉变形（D _JB2B ）导致胶体-壳状脉的角砾化和天然金的同时沉积。晚期逆断层记录了由 NE-SW 方向的缩短（D _JB3 ）引起的第三个矿化阶段的证据。这一后期阶段的矿化主要是低品位矿化，局部存在超高品位矿带（> 100 g/t）。每个事件都记录了跨越局部变形历史的持续热液活动期间流体化学的瞬态变化。我们认为，在 Jundee 金矿床，三个多相矿化阶段的长期金富集导致了高品位金矿石的形成。尽管 Jundee 矿床记录了完整的成矿历史，但 Bogada 矿区的金仅在收缩后期 (D _JB3 ) 才被引入，导致大量低品位赋存。 我们假设高品位造山金矿床中金的富集是长期成矿事件空间叠加的直接结果。