If the value of gold is defined ONLY by the cost/effort/energy of mining it and the cost of mining silver is similar, then the prices should be similar and not orders of magnitude different per troy ounce.
The cost of mining gold and silver is obviously not the same.
Since silver is often the byproduct of mining gold, the energy price should be pretty close, I'd think...
Crypto-bros reinventing the (train-wreck of) labour theory of value is my favorite genre of HN comments.