Significant amounts of mining wastes containing Fe-oxide rich phases (i.e., hard rock dumps, tailing impoundments) have been historically deposited in semiarid soils within Durango City. Urban mapping along with mineralogical and geostatistical analyses were carried out to determine levels of concentration, spatial distribution, and relationships between As-bearing and Pb-bearing phases and their mobilities for different sites around this city. It was found that fine As-bearing particles (<5–10 μm) comprised of Pb₃(AsO₄)₂-like, FeAsS, and complex structures were the main phases in urban sprawl soil, while PbO₂-like, PbS, and (Ba, Pb)SO₄-like were the main Pb-bearing phases (<5 μm). Levels of As and Pb vary in urban sprawl soil from 4.37 to 42 and 8.3 to 82.5 mg kg⁻¹, respectively, and are higher in the soil adjacent to Cerro de Mercado, where the mining area is conurbated, from 55.1 to 221 and 21.6 to 107.3 mg kg⁻¹, respectively. Most of these concentrations were associated with the finest soil fraction (<10–250 μm), enhancing health risks due to inhalation or incidental intake. The spatial distribution patterns of these elements were mainly related to high traffic density and mining waste for Pb, and eolic dispersion of fine soil particles for As. A low mobility was found for Pb (up to 3%), indicating a low environmental risk if released, whereas As mobility changes from a low to a medium risk level (0.1–37.1%). Geostatistical analysis suggested correlations between soil pollution and distance regarding hard rock and tailing impoundment sources.

历史上，大量的含有富铁氧化物相的采矿废物（即硬石堆，尾矿蓄积物）已沉积在杜兰戈市的半干旱土壤中。进行了城市制图，并进行了矿物学和地统计学分析，以确定该城市不同地点的集中度，空间分布以及含砷和含铅阶段之间的关系及其迁移率。结果发现，城市蔓延土壤的主要相是由Pb ₃（AsO ₄）₂类，FeAsS和复杂结构组成的含As细颗粒（< 5–10μm ），而PbO ₂类，PbS，和（Ba，Pb）SO ₄主要的Pb相（<5μm）类似。在城市蔓延土壤中，As和Pb的含量分别从4.37至42和8.3至82.5 mg kg ^-1变化，在矿山繁华的Cerro de Mercado附近的土壤中，As和Pb的含量从55.1至221和21.6更高。至107.3 mg千克^-1， 分别。这些浓度中的大多数与土壤中最细的部分（<10–250μm）有关，由于吸入或偶然摄入而增加了健康风险。这些元素的空间分布模式主要与铅的高交通密度和采矿废物以及砷细土颗粒的风沙分散有关。发现铅的迁移率很低（最高3％），表明释放后环境风险很小，而铅的迁移率则从低风险变为中等风险水平（0.1–37.1％）。地统计分析表明，硬石和尾矿蓄积源的土壤污染与距离之间存在相关性。