In Lords Mobile Metal Harvesting research increases the production rate of all your mines. It is found in the economics tree.
There are 10 levels in total and once maxed you will have boosted your ore production rate by 80%. You need to have researched food harvesting before you can unlock metal harvesting.
The table below has the resource cost and time to upgrade each level. It also shows the might and rewards granted. You can find out your own research time by using our research calculator.
Metal Harvesting Research Requirements
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