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wakka55 t1_j7dav8a wrote

couldnt they like chisel a rock with their initials? digging up lead ore from a mine and refining it just to bury it for centuries sounds expensive still.

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LuckyPoire t1_j7dcs3l wrote

Since metal detection was invented I think metal has been preferred to rock for that reason.

But I think you are right that older markers were generally stone.

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Riptides75 t1_j7dgofo wrote

Lead was often a by-product of silver/zinc mining. It's also not so difficult to refine.

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