Gems
There is a small chance you will dig up a gem when you mine,
the ones you can get are sapphires,emeralds,rubys, and diamonds.
Ore
Ore is used to make weapons after smelting, the smelting combonations
will be explained shortly.
Ores:
Ores Minimum Mining level
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Bronze ore minimum: level 1
Tin ore minimum: level 1
Iron ore minimum: level 15
Mithril ore minimum: level 55
Adamantite ore minimum: level 70
Runite ore minimum level 85
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There is stuff other than ores and gems to mine.
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Silver minimum level 20
Coal minimum level 30
Gold minimum level 40
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And now for the smelting combinations.
Copper ore + tin ore = bronze bar level 1
Iron ore= iron bar(50% of the time) level 15
Iron ore + coal x2 = steel bar level 30
Mithril ore + coal x4=mithril bar level 50
Adamantinte ore + coal x6 = adamantite bar level 70
Runite ore + coal x8 = runite bar level 85
Silver= silver bar level 20
Gold = gold bar level 40
thats it for the mining/smithing area.