Satria Bijaksana, Masrurah Zakia, Fajar Silvia Jannatul
Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Jalan Ganesha 10, Bandung 40132, Indonesia.
Heliyon. 2021 Dec 9;7(12):e08584. doi: 10.1016/j.heliyon.2021.e08584. eCollection 2021 Dec.
Almost all of the iron sand found in Indonesia, from Sumatra to Papua, is sandy deposit. Despite its variety of minerals, iron sand is commonly mined for low economic uses such as building material. As iron sands from different localities might have different characteristics (grain-size distribution, mineralogy, magnetic properties), such characteristics might in turn be used for provenance study or for selective mining. This study aims to examine iron sand deposits from two geographically close but geologically different regions, Lampanah and Anoi Itam, and to test the grain size distributions and their relationship with magnetic susceptibility as well as Fe content. In both Lampanah and Anoi Itam, the sizes of iron sands were predominantly medium sand (MS) and fine sand (FS), but they differed in mass percentage (M%). Generally, magnetic susceptibility increases as grain size decreases. Fe content is also grain size dependent, with higher Fe content in finer sizes. The results imply that the combination of grain size distribution and magnetic mineral composition might be used not only as a provenance indicator for iron sand deposits, but also as a criterion for selective mining.
在印度尼西亚，从苏门答腊到巴布亚发现的几乎所有铁砂都是砂质沉积物。尽管铁砂含有多种矿物质，但通常因其经济用途较低而被开采用作建筑材料等。由于来自不同地区的铁砂可能具有不同的特性（粒度分布、矿物学、磁性），这些特性反过来可用于物源研究或选择性开采。本研究旨在考察两个地理位置相近但地质条件不同的地区——兰帕纳和阿诺伊伊坦的铁砂矿床，并测试其粒度分布及其与磁化率以及铁含量的关系。在兰帕纳和阿诺伊伊坦，铁砂的粒度主要为中砂（MS）和细砂（FS），但它们的质量百分比（M%）有所不同。一般来说，磁化率随着粒度的减小而增加。铁含量也取决于粒度，细粒度中铁含量较高。结果表明，粒度分布和磁性矿物成分的结合不仅可以用作铁砂矿床的物源指示，还可以作为选择性开采的标准。
