mine

rednet.open("right")
rednet.broadcast("ON")
rednet.close()

args = {...}

turtle.refuel()

if #args == 0 then
    mid_fuel = math.ceil(turtle.getFuelLevel() / 2) - 10
end
if #args == 1 then
    mid_fuel = math.ceil(tonumber(args[1]))
end
if (mid_fuel * 2) > turtle.getFuelLevel() then
    print("Not enough fuel: "..turtle.getFuelLevel().." left and "..(mid_fuel * 2).." required.")
    return
end

counter = 0
while true do
    if counter == mid_fuel then
        turtle.turnRight()
        turtle.turnRight()
    end
    print(counter.." / "..(mid_fuel * 2).." ("..turtle.getFuelLevel().." fuel left)")
    if counter == (mid_fuel * 2) then
    turtle.turnRight()
    turtle.turnRight()
        return
    end
    if turtle.detect() then
        turtle.dig()
        turtle.refuel()
    else
        turtle.forward()
    end
    counter = counter + 1
end