Silver's crust abundance is 0.0000079%, so about 2000x more common than gold. Let's use the numbers already generated for gold:
\[{2000\cdot580\textrm{ deposits}\over 57,000,000\textrm{ mi}^2}\cdot 347\textrm{ mi}^2 = 2\%\]
For now, I'll ignore galena and pretend we're mining pure silver (galena, remember, is only about 2% silver). Just like with gold, we see an opportunity to increase the occurrence alongside chalcopyrite, which is quickly becoming my favorite mineral. So, to get the placement for gold and silver down, I need to tackle copper ores.
Edit: In which I correct a mistake.
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