Quality of Mine (CBD)

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Because a mine has been established does not mean that it automatically yields valuable metal or gems. The quality of the ore must be determined. Even the highest quality metal requires some processing before it can be sold.
==Metal==
If the yield of the mine is a metal, it will probably be in the form of ore (metal-bearing rock). While pure nuggets may be discovered occasionally, a character with the smelter proficiency must separate the metal from the ore.
The quality of the ore is equal to the number of coins that can be produced from it by a single miner in one week. A copper mine, with a rating of 200 cp, would mean that a single miner, working for one week, produces a pile of ore that can yield 200 cp of copper when smelted. The amount of coinage indicates how much is produced, not that coins must be produced. One-thousand coins of iron, for example, equal one suit of plate armor, 100 spear heads, or 500 arrowheads.
To determine the quality of the mined ore, roll 1d10 and compare it to the result for that metal on the Ore Quality Table. This equals the coin equivalent produced per week per miner. 
 Ore Quality Table (Roll 1d10)
Metal 	1 	2 	3 	4 	5 	6 	7 	8 	9 	10*
Copper 	100	200	250	300	350	400 	500 	750 	1000	2000
Iron 	200	300	500	700	900	1200	1600	2000	3000	4000
Silver 	25 	50 	100	200	300	400 	500 	750 	1000	2000
Gold 	10 	25 	50 	100	200	300 	400 	500 	750 	1000
Platinum	5 	10 	20 	40 	75 	100 	250 	400 	800 	1000
: *If a 10 is rolled, roll 1d10 again. If another 10 results, the mine is a pure vein of the highest quality and requires no smelting. If 1-9 results, the metal must be smelted.
Ideally, the smelted metal has the same value as its coin equivalent: i.e., 20 10-coin ingots of silver are worth 200 sp. In a true medieval economy, however, everything is negotiable. Miners may not be able to get this much for their bullion, or may get more, depending on local conditions, who the buyer is, and regional supply.
If a character sells the ore without smelting, the selling price can be no more than 25% of the value of the pure metal, and it may be as low as 5%. The asking price will depend on the difficulty of transportation and the cost of smelting the ore.
==Gemstones==
Newly mined gemstones are not nearly as valuable as they are after finishing. Gemstones are rough and even unrecognizable when first discovered. Characters with the Mining or Gem Cutting proficiencies can correctly identify a stone after 1d6 rounds of study.
The quality of a gemstone mine depends on the number of stones in each find and the value of the stones. The number of stones is that which one miner can excavate in one week.
The value of the stones is the average value for an uncut stone, which is 10% of its cut value. To realize the full amount from the gemstones, a miner needs to employ a character with the Gem Cutting proficiency. Some stones are more or less valuable than this amount, but the average is as accurate as we need to get to calculate the income from the mine.
The output of a gemstone mine does not remain constant, it is rolled each week to determine the worth of that week's output. The number of miners at work each week is determined before the dice are rolled.
 Gemstone Quality Table
Class ofStone	#/dwarf/week	AverageUncut Value
Ornamental 	4d10 	1 gp
Semi-precious	3d6 	5 gp
Fancy 	1d12-1 	10 gp
Precious 	1d10-1 	50 gp
Gems 	1d6-1 	100 gp
Jewels 	1d4-1 	500 gp
In addition to the base value of the stones mined in a given week, there is a 1% chance per week of operation that a miner will discover an exceptional stone. If an exceptional stone is found, its value is equal to the base value of the mine's stones multiplied by a d100 roll. For example, an exceptional stone found in a semi-precious stone mine is worth 10 gp (the average value of an uncut, semi-precious stone) x d100. Players may also consult the Type of Stones Table to determine the exact types of stones found.
===Types of Stones Table===
 
 Ornamental Stones
1d100	Stone Type
01-08	Azurite
09-16	Banded Agate
17-24	Blue Calcite
25-32	Eye Agate
33-40	Hematite
41-48	Lapis Lazuli
49-56	Malachite
57-64	Moss Agate
65-73	Obsidian
74-82	Rhodocrosite
83-91	Tiger Eye Agate
92-00	Turquoise
 
 Semi-Precious Stones
1d100	Stone Type
01-07	Bloodstone
08-15	Carnelian
16-23	Chalcedony
24-31	Chrysoprase
32-39	Citrine Quartz
40-47	Jasper
48-55	Moonstone
56-59	Onyx
60-67	Quartz Crystal
68-75	Rose Quartz
76-83	Sardonyx
84-91	Smoky Quartz
92-00	Zircon
 
 Fancy Stones
1d100	Stone Type
01-12	Alexandrite
13-25	Amber
26-38	Amethyst
39-51	Chrysoberyl
52-64	Flourite
65-77	Jade
78-90	Jet
91-00	Tourmaline
 
 Precious
1d100	Stone Type
01-25	Aquamarine
26-50	Blue Spinel
51-75	Peridot
76-00	Topaz
 
 Gems
1d100	Stone Type
01-25	Garnet
26-50	Jacinth
51-75	Opal
76-00	Red Spinel
 
 Jewels
1d100	Stone Type
01-25	Diamond
26-50	Emerald
51-75	Ruby
76-00	Sapphire
Category:The Complete Book of Dwarves