As a pre-Revolutionary War mining site, Mineral Hill, near today’s Liberty Reservoir, produced iron, extracting it from a thick hematite ore vein. Later, during a 19th-century expansion, copper was mined along with trace minerals like chalcopyrite and bornite, with shafts reaching 400 ft deep and employing up to 100 miners. Now, magnetite, chalcopyrite, actinolite, malachite, […]

Cost: $10-15