commercial ores and secondary minerals by state, county, township, and geologic range. For easy identification...cities, and many of today’s prosperous western county seats began as mining-boom camps. trating sand...Whether you such as those listed alphabetically by county, township, and range in Part II of this book. Where...accidental discovery of useful ore minerals from which metals, particularly copper and later iron, could be extracted...copper, zinc to ably as a result use of alloying metals— tin to make bronze out of copper— was developed |