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Earth and Space Sciences · 术语表

什么是 Grade–tonnage curve？

又称： grade--tonnage curve

Definition 29.12 University Earth and Space Sciences — Year 2 · 第 29 章 — Ore Deposits

The grade–tonnage curve of a deposit gives, as functions of the cut-off grade $c$ , the tonnage $T(c)$ of the blocks with a grade above $c$ and their mean grade $\bar g(c)$ .

Left: tonnage and copper grade of the 422 porphyry copper deposits, with lines of equal contained copper (0.1 to 100\, Mt); the red square is Bingham Canyon. Data: Singer, Berger and Moring (2008), USGS. Right: the grade–tonnage curve of an illustrative deposit of 1000\, Mt, median grade 0.40\,\%, s = 0.60: tonnage above the cut-off (blue) and its mean grade (red, dashed), from . — Left: tonnage and copper grade of the 422 porphyry copper deposits, with lines of equal contained copper (0.1 to $100\,\mathrm{Mt}$ ); the red square is Bingham Canyon. Data: Singer, Berger and Moring (2008), USGS. Right: the grade–tonnage curve of an illustrative deposit of $1000\,\mathrm{Mt}$ , median grade $0.40\,\%$ , $s = 0.60$ : tonnage above the cut-off (blue) and its mean grade (red, dashed), from (29.4).

Left: tonnage and copper grade of the 422 porphyry copper deposits, with lines of equal contained copper (0.1 to 100\, Mt); the red square is Bingham Canyon. Data: Singer, Berger and Moring (2008), USGS. Right: the grade–tonnage curve of an illustrative deposit of 1000\, Mt, median grade 0.40\,\%, s = 0.60: tonnage above the cut-off (blue) and its mean grade (red, dashed), from . — Left: tonnage and copper grade of the 422 porphyry copper deposits, with lines of equal contained copper (0.1 to $100\,\mathrm{Mt}$ ); the red square is Bingham Canyon. Data: Singer, Berger and Moring (2008), USGS. Right: the grade–tonnage curve of an illustrative deposit of $1000\,\mathrm{Mt}$ , median grade $0.40\,\%$ , $s = 0.60$ : tonnage above the cut-off (blue) and its mean grade (red, dashed), from (29.4).

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