The Monarch and Kicking Horse ore deposits in Yoho Park, B. C. represent former connected ore-runs separated by the subsequent valley-cutting of the Kicking Horse river. The "tele-thermal" deposits consist of lead-zinc ores formed by replacement of brecciated, crystalline, Cambrian dolomite. The brecciation resulted from fracturing of competent beds during anticlinal folding and afforded channelways for first, the dolomitizing solutions and second, for metallizing solutions of igneous derivation. The lead-zinc ratios indicate that zinc was more mobile than lead.

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