In the midwestern Minas Gerais, Brazil, kimberlite intrusions, particularly kamafugite and alkaline complexes, occur along the NW-SE-oriented Alto Paranaíba structural high. Diamonds in this region were discovered in the Bagagem River and later in the alluvial deposits of the Santo Antônio do Bonito, Santo Inácio and Douradinho rivers. Diamond-bearing kimberlites observed in the region are the primary sources of diamond deposits, as in the case of the Vargem Bonita diggings-in the upper São Francisco River. However, the primary sources of the alluvial diamonds that occur in the Santo Antônio do Bonito, Santo Inácio, and Douradinho rivers have not been clarified. These diamond populations have characteristics common to all three drainage area, where large stones are frequently recovered. Diamond accumulation in the alluvium is due to the erosion and re-concentration of material from basal conglomerate of the Capacete Formation. There is evidence that the sources that fed the conglomerate are local diamond-bearing kimberlites of approximately 90–120 Ma underlying the Capacete Formation, which in an upper unit of the Mata da Corda Group. Recent fieldwork led to the location of a kimberlite intrusion in the Santo Inácio River Basin, southeast of Coromandel. The intrusion fulfills the requirements constituting a primary source of diamonds in the area.

在巴西米纳斯吉拉斯州的中西部，金伯利岩侵入体，特别是 kamafugite 和碱性复合体，沿着 NW-SE 取向的 Alto Paranaíba 构造高发生。该地区的钻石是在 Bagagem 河中发现的，后来又在 Santo Antônio do Bonito、Santo Inácio 和 Douradinho 河的冲积矿床中发现。在该地区观察到的含钻石金伯利岩是钻石矿床的主要来源，例如圣弗朗西斯科河上游的 Vargem Bonita 矿区。然而，Santo Antônio do Bonito、Santo Inácio 和 Douradinho 河流中的冲积钻石的主要来源尚未阐明。这些钻石种群具有所有三个流域的共同特征，在这些流域中经常回收大石头。冲积层中的金刚石堆积是由于 Capacete 地层基底砾岩中的物质受到侵蚀和重新浓缩。有证据表明，该砾岩的来源是位于 Capacete 组下方的约 90-120 Ma 的当地含钻石金伯利岩，该组位于 Mata da Corda 组的上层单元。最近的实地工作导致在科罗曼德东南部的圣伊纳西奥河流域发现金伯利岩侵入体。侵入满足构成该地区钻石主要来源的要求。它位于 Mata da Corda 集团的上层单位。最近的实地工作导致在科罗曼德东南部的圣伊纳西奥河流域发现金伯利岩侵入体。侵入满足构成该地区钻石主要来源的要求。它位于 Mata da Corda 集团的上层单位。最近的实地工作导致在科罗曼德东南部的圣伊纳西奥河流域发现金伯利岩侵入体。侵入满足构成该地区钻石主要来源的要求。