Picher field underground mine workings of the abandoned Tri-State Lead-Zinc Mining District in the United States

Mining began in the Picher field, in the Oklahoma and Kansas portion of the Tri-State Lead-Zinc Mining District in the United States, during the 1900s and ceased in the 1970s, producing an estimated 1.5 million metric tons (m-tons) of lead and 8 million m-tons of zinc. Over 400 historical maps of the underground mine workings were compiled into a single, easily editable map. This map was used to create 3D renderings for calculation of underground mine workings area and volume estimates. The workings have an estimated volume of 9,870 ha-meters (80,000 ac-ft), covering an area of 1,440 hectares (3,560 acres). The map and subsequent calculations should be considered to be based on the minimum extent of the mining field due to the likelihood that many historical maps were likely lost or destroyed. The format of the map allows for continuous updates as new information becomes available.

美国三州铅锌矿区（Tri-State Lead-Zinc Mining District）俄克拉荷马州与堪萨斯州境内的皮彻矿区（Picher field），其采矿活动始于20世纪初期，1970年代终止，累计产出铅约150万公吨（m-tons）、锌约800万公吨（m-tons）。研究人员将超过400份地下矿井巷道历史地图整合为一份易于编辑的统一地图。该地图被用于生成三维渲染模型，以测算地下矿井巷道的面积与体积。经测算，该矿区巷道总体积约为9870公顷-米（ha-meters），合80000英亩-英尺（ac-ft），覆盖面积达1440公顷（3560英亩）。鉴于大量历史地图可能已遗失或损毁，本地图与后续测算结果仅代表该矿区的最小开采范围。该地图的格式支持随新信息获取进行持续更新。