Corvid Keep Mining Operations

Coal Mine Resources
Coal - 89 months mine lifespan expectancy (*assessment on current deposits easily accessible) The value of the deposit is expected to be 16 units: 16 gold pieces worth of material per week per miner.
Gemstones
Jet, and Amber (100 gp each) harvested at a monthly rate of operation.

Stone Quarry Resources
Granite - 40 weeks or 1 year and 4 months life left. The current value is of the unit is 7 gp (7gp/wk/miner). Red hues and striations throughout the deposit.
Gemstones
Bloodstone - 50 gp each
Tourmaline valued at 100 gp (these pockets will be more difficult to find higher quality of gems)

Basalt stone The lifespan of this deposit is about a year or 36 weeks. The value of the unit is 16 gold pieces (16 gp/wk/miner)
Gemstones
Obsidian - 10 gold pieces.

Silver
72 weeks or 2 years’ worth of silver ore, valued at 90 gold pieces per unit (90 gp/wk/miner)

Copper
173 weeks or 4 years and 11 months, valued at 45 gold pieces per unit (45 gp/wk/miner)
Current smelting equipment
Bloomery - 20% efficient for refining ore. Which means that current value of refined ore is: Silver - valued at 18 gp smelted Copper - valued at 9 gp smelted.
Recommended that you construct a Blast Furnace of some type the higher the tier the more the cost to build but the higher efficiency of smelted ore.