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Potential deposits of selected metallic resources on L chondrite parent bodies

机译：L球粒陨石母体上某些金属资源的潜在沉积物

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The authors have undertaken research aimed at determining the abundance of metallic resources on parent bodies of ordinary chondrites. In this report, they present their findings concerning L chondrites, whose parent S asteroids make about 17% of all asteroids in the main belt and ca. 66% of NEAs. The abundances, and their variations, of selected metals in the rocks of L chondrites were studied based on a bulk chemical composition analysis. The authors also analysed the abundances of selected metals in FeNi alloy grains crystallizing in the forms of kamacite, taenite and tetrataenite. These are the only minerals that they considered to be ore minerals forming potential deposits of metallic resources on L chondrite parent bodies. Further analyses focused on the distribution and concentration of FeNi alloy grains in L chondrite rocks, and finally also on the influence of the structure of rocks building the surfaces of asteroids on the feasibility and the method of extracting metallic resources from these bodies. The conducted analyses demonstrated that the abundances of Fe, Ni, Cr, Co, Cu and Au on L chondrite parent bodies are higher, and the abundances of REE - much lower than those in the Earths crust, where the majority of the currently mined metallic resources are found. Ni content in L chondrite rocks is 1.7 times as high as that in terrestrial nickel deposits, and Co content - 2.5 times as high as its minimum abundance in terrestrial deposits. As Fe, Ni, Co, Cr, Cu and Au occur in parent bodies in mineral association, they form poly metallic deposits. Co and Ni could be considered the main mineral resource on the parent asteroids of L chondrites, while Fe, Au, Cu and Cr could be accompanying minerals.Rocks with the composition of L chondrites contain 9.2 wt% of FeNi grains distributed evenly throughout the rock. Ore mineral content does not change with depth on ordinary chondrite parent bodies with onion shell structure and it is the same in pieces of regolith from the rubble pile asteroids. The high abundance of ore minerals and their even distribution in space make it possible to regard the whole asteroid as an abundant deposit of metallic resources. Metallic resources are also found on asteroid surfaces, which could enable open-pit mining at any place without previous prospection work or the need to remove the overburden. The presence of regolith and the high porosity of rocks underlying it directly will considerably facilitate the crushing of the excavated material and processing the ore. The estimated Ni and Co resources on 4179 Toutatis asteroid, being the most likely the parent body of L chondrites, would satisfy the current needs of the humankind for the nearest 200 years, and Cr, Fe, and Au resources - for a few years.
机译：作者进行了旨在确定普通球粒陨石母体上金属资源丰富度的研究。在这份报告中，他们介绍了有关L球粒陨石的发现，其母S小行星约占主带和大行星中所有小行星的17％。 NEA的66％。基于整体化学组成分析，研究了L球粒陨石岩石中所选金属的丰度及其变化。作者还分析了以镍铁矿，钙铁矿和四钙铁矿形式结晶的FeNi合金晶粒中所选金属的丰度。这些是他们认为是在L球粒陨石母体上形成金属资源潜在沉积物的矿石矿物。进一步的分析集中在L球粒陨石岩石中的FeNi合金晶粒的分布和浓度，最后还分析了构成小行星表面的岩石结构对从这些小行星中开采金属资源的可行性和方法的影响。进行的分析表明，L球粒陨石母体上的Fe，Ni，Cr，Co，Cu和Au的丰度较高，而REE的丰度则远低于地壳中的稀土（目前大多数开采的金属找到资源。 L球粒陨石中的Ni含量是陆地镍矿床的1.7倍，Co含量-陆地矿床最低丰度的2.5倍。由于Fe，Ni，Co，Cr，Cu和Au以矿物质的形式存在于母体中，因此它们形成了多金属沉积物。钴和镍被认为是L球状陨石母体小行星上的主要矿物资源，而Fe，Au，Cu和Cr可能是伴随矿物.L球状陨石组成的岩石中9.2 wt％的FeNi晶粒均匀分布在整个岩石中。在具有洋葱壳结构的普通球粒陨石母体中，矿石矿物含量不会随深度变化，而在碎石堆小行星中的碎屑块中，矿石的矿物含量也不会变化。矿产资源丰富且空间分布均匀，因此有可能将整个小行星视为丰富的金属资源矿床。在小行星表面上也发现了金属资源，这可以在任何地方进行露天开采，而无需事先进行勘探工作或无需清除覆盖层。 Regolith的存在以及直接位于其下方的岩石的高孔隙度将极大地促进挖掘材料的破碎和矿石的加工。估计的4179个Toutatis小行星上的Ni和Co资源，最有可能是L陨石的母体，将满足人类近200年的当前需求，以及Cr，Fe和Au的资源-几年。

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