Copper
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is a trace mineral, meaning it is needed in a very small quantity. Its primary role is to help form hemoglobin and collagen in the body.
A deficiency in copper results in poorly formed red blood cells, known as anemia. It also is an antioxidant, helping with the elimination of free radicals.
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Copper deficiency symptoms can include increased parasitic infections, weakness from anemia and leaky gut.
Copper must stay in balance with zinc and iron in the body as well and if you consume too much of one it can throw the others out of balance.
The RDA for copper is 900 mcg/day. 
The Daily Value is 2 mg.

Top 10 Copper Rich Foods List

1) Beef liver3 oz: 14 mg, over 100% 
Beef liver3: fried beef liver with vegetables
2) Dark chocolate 1 square: 0.9 mg 45% 
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3) Dried apricots1 cup: 0.69mg (34% 
dried apricots: Dried apricots close-up
4) Sunflower seeds¼ cup: 0.63 mg -- 31% 
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5) Almonds¼ cup: 0.4 mg, 20% DV
almonds: group of almonds isolated on white
6) Blackstrap molasses2 tsp: 0.28 mg | 14% DV

7) Lentils1 cup: 0.5mg | 25% DV

8) Mushrooms1 cup: 0.43 mg | 20% DV