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123

"It is difficult to form any correct judgement concerning the percentage of these ores, particularly the gossaw for they are continually changing their relative proportions of copper, iron, and clay, so that a few analyses would not decide the matter. According to the report of Dr. Owen, three average specimens of the lump ore yielded respectively 23.24 1/3 and 35.7 per cent of copper; and in the same report he says that the gossaw yields by analyses from six to nine percent of pure copper.

"Other discoveries of copper ore have been made in the Territory though none of them have yet proved important. I saw one of good quality from the Blue river country and visited a mine, a thin rock vein, near the Pickatonica about five miles north of the Illinois line. In this neighbourhood I discovered some fine clay apparently of excellent quality, which may be of no little importance in making fine brick for liningo for the furnaces. It is an alluvial bed six feet thick, at Winslow on the Pickatonica where it crosses the state line."