Sentence:  Manganism has been known about since the 19th century, when miners exposed to <WSD>ores</WSD> containing manganese, a silvery metal, began to totter, slur their speech and behave like someone inebriated. 
Meaning of the word marked with <WSD> tags:  Rock that contains utilitarian materials; primarily a rock containing metals or gems which&mdash;at the time of the rock's evaluation and proposal for extraction&mdash;are able to be separated from its neighboring minerals "and" processed at a cost that does not exceed those materials' present-day economic values.