If you come to Omega 7 with DSE you are likely to be shot, if you want to mine Copper in Omega 7 either be IMG/Kruger or Daumann. Independent Miner ID also gives a bonus, but it is a reduced yield
Also the Prices for selling ore on the Wiki is not upto date. Copper now has the best selling price in Texas(10.5k per unit) and Cobalt and Silver sell for a similar price(around 7.8k per unit). If you choose Copper remember that if you are trying to take it to Texas through Rheinland there is an Embargo and you could be stopped and the Ore ceased by the Rheinland Military in Hamburg