I did some time ago a benchmarking study on 12 Canadian gold mines, which dominantly employ Longhole Open Stoping with some also using Cut and Fill mining. The relationship between opex and capex versus mining width is striking. Unfortunately the operating performance information does not provide average width mined, but annual treatment rate is strongly related to mining width as productivity increases with such width. Treatment rate can be seen as a proxy for mining width. The mines in the sample extracted ore from very narrow veins (e.g. Harte, Macassa) to locally very wide at tens of metres (e.g. Seabee, Young-Davidson, Meliadine).
Anyway, see below the relationship between Opex (blue) and Capex (red) with production rate. These are total operating cost including processing and G&A. Processing cost will be all in the same ball park for these mines, G&A highly determined by economies of scale and the balance for mining cost. Capex is predominanty underground development to open up new stopes.
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