HIFLD Open Agricultural Minerals Operations

This map layer includes agricultural minerals operations in the United States. The data represent commodities covered by the Minerals Information Team (MIT) of the U.S. Geological Survey. The mineral operations are plants and (or) mines surveyed by the MIT and considered currently active in 2003. This is a replacement for the June 2004 map layer. The data is legacy and not expected to be updated. The data should be displayed and analyzed at scales appropriate for 1:2,000,000-scale data.

本地图图层涵盖美国境内的农用矿产作业活动。本数据集收录美国地质调查局（U.S. Geological Survey）矿产信息团队（Minerals Information Team, MIT）所覆盖的矿产品类。所述矿产作业为该团队经调查确认、并于2003年仍处于活跃状态的矿山及（或）矿物加工厂。本图层为2004年6月版地图图层的替代版本。本数据集属于遗留数据，预计不会再进行更新。该数据集的展示与分析应适配1:2,000,000比例尺数据的适用尺度。