Turtle Quarry 1.0 (Not Tested)

-- Main Function

function main()
    display()
    print("Quarry will consist of a 16x16 square...")
    print("Please place ender-chest in slot 16...")
    event, key = os.pullEvent("key")
    if key == "keys.space" do
        x,y,z = gps.locate(5)
        if not x then
            print("GPS did not work...")
        end
        result = 256*y
        if turtle.getFuelLevel() < result then
            print("Not enough fuel for entire quarry...")
            print("Please insert fuel...")
            print("Press SPACE to proceed...")
            event, key == os.pullEvent("key") do
            if key == "keys.space" then
                main()
            end
        end
        quarry()
    end
end

-- Mini Functions

function quarry()
    for i = 0,y do
        for w = 1,16 do
            row()
            turtle.turnRight()
            turtle.dig()
            turtle.forward()
            turtle.turnRight()
            turtle.forward()
            row()
            turtle.turnLeft()
            turtle.dig()
            turtle.forward()
            turtle.turnLeft()
            turtle.forward()
        end
        turtle.select(16)
        turtle.select(1)
        for e = 1,16 do
            turtle.select(e)
            turtle.drop()
        end
        turtle.select(16)
        turtle.dig()
        turtle.select(1)
    end
end

function row()
    for q = 1,16 do
        turtle.digUp()
        turtle.digDown()
        turtle.dig()
        turtle.forward()
    end
end
function display()
    term.clear()
    term.setCursorPos(1,1)
    print("Quarry Miner 1.0")
end

-- Function List

main()