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/c local surface = game.player.surface;
local ore = nil
local size = 5
local density = 10
for y=-size,size do
 for x=-size,size do
  a = (((size+1) - math.abs(x))*10)
  b = (((size+1) - math.abs(y))*10)
  if a < b then
   ore = math.random(((a*density)-(a*(density-8))),((a*density)+(a*(density-8))))
  end
  if b < a then
   ore = math.random(((b*density)-(b*(density-8))),((b*density)+(b*(density-8))))
  end
  surface.create_entity({name="copper-ore", amount=ore, position={game.player.position.x+x, game.player.position.y+y}})
 end
end