SimpleMiner

local fuel = turtle.getFuelLevel()

-- Make sure size is an even number
local depth = 20
local size = 20

local movedX = 0
local movedZ = 0
local movedY = 0

local lastRight = false

function start()
    for i=1,depth,1 do
        layer()
        dropItems()

        turtle.digDown()
        turtle.down()
        turtle.digDown()
        turtle.down()
       movedY=movedY+2
    end
end

function dropItems()
     for i=1,movedY,1 do
        turtle.up()
    end
    turtle.turnLeft()
    turtle.turnLeft()
    for i=1,15,1 do
        turtle.select(i)
        if turtle.compareTo(16) then
            turtle.transferTo(16)
        end
    turtle.drop()
    end
    turtle.select(1)
    for i=1, movedY,1 do
        turtle.down()
    end
end

function fuelUp()
    if fuel < 10 then
        turtle.select(16)
        turtle.refuel()
        turtle.select(1)
    end
end

function checkFront()
    while turtle.detect() do
        turtle.dig()
    end
    turtle.forward()
    while turtle.detectUp() do
        turtle.digUp()
    end
end

function turn()
    if lastRight==true then
        turtle.turnLeft()
    else
        turtle.turnRight()
    end
end

function layer()
    for i1=1,size,1 do
        for i=1,size,1 do
            print("Minning Row: "..i1.."| Column: "..i)
            fuelUp()
            checkFront()
            movedX=movedX+1
        end
        turn()
        turtle.forward()
        turn()
        lastRight = not lastRight
        movedZ=movedZ+1
    end
    lastRight = not lastRight
    turn()
    for i=0,movedX,1 do
        turtle.forward()
    end
    turn()
end

start()