chunkmine 1.0

local height = 67
local width = 16
function checkEC()
  local dump = false
  for i=3,16,1 do
    turtle.select(i)
       local stackSize = turtle.getItemCount()+turtle.getItemSpace()
    local p = math.floor((turtle.getItemCount()/stackSize)*100)
       if p >= 50 then
      dump = true
    end
    if i == 16 and turtle.getItemCount() > 0 then
      dump = true
    end
  end
  if dump == true then
    turtle.select(1)
    turtle.digUp()
    turtle.placeUp()
    for i=3,16,1 do
      turtle.select(i)
      turtle.dropUp()
    end
    turtle.select(1)
    turtle.digUp()
  end
  if turtle.getFuelLevel() < 1000 then
    turtle.digUp()
    turtle.select(2)
    turtle.placeUp()
    turtle.suckUp()
    turtle.refuel()
    turtle.digUp()
  end
  turtle.select(3)
end

function mine()
  while turtle.detect() do
    turtle.dig()
  end
end

function move()
  checkEC()
  while turtle.detect() do
    mine()
  end
  turtle.forward()
end

function main()
  for y=1,height-5,1 do
    turtle.digDown()
    turtle.down()
    for x=1,width,1 do
      for z=1,(width-1),1 do
        move()
      end
      if x % 2 == 1 then
        if x >= width then break end
        turtle.turnLeft()
        move()
        turtle.turnLeft()
      else
        if x >= width then break end
        turtle.turnRight()
        move()
        turtle.turnRight()
      end
    end
    turtle.turnLeft()
    for i=1,16,1 do
      while not turtle.forward() do end
    end
    turtle.turnLeft()
  end
end

main()