quarry

function EatFuel()
    for i = 1,16,1 do
        local data = turtle.getItemDetail(i)
        if data then
            if data.name == "minecraft:coal" then
                turtle.select(i)
                turtle.refuel(1)
                return true
            end
        end
    end
    return false
end

function CheckFuelAndRefuel()
    local fuelLevel = turtle.getFuelLevel()
    if fuelLevel == 0 then
        if EatFuel() == false then
            return false
        end
    end
end

function CanGetHome(dist)
    local fuelLevel = turtle.getFuelLevel()
    if fuelLevel-1 <= dist then
        local res = EatFuel()
        return res
    end
    return true
end

function ManageInventory()
    AllowedItemsTable = {
        ["minecraft:diamond"] = true,
        ["minecraft:emerald"] = true,
        ["minecraft:redstone"] = true,
        ["minecraft:lapiz"] = true,
        ["minecraft:coal"] = true,
        ["galacticraftcore:basic_item"] = true,
        ["galacticraftcore:basic_block_core"] = true,
        ["minecraft:dye"] = true
    }
    for i = 1,16,1 do
        local data = turtle.getItemDetail(i)
        if data then
            if AllowedItemsTable[data.name] == nil then
                turtle.select(i)
                turtle.drop()
            end
        end
    end
end

function Quarry()
    local distance = 0
    local digsuccess = true
    local belowempty = false
    local success = true
    repeat
        digsuccess = turtle.digDown()
        belowempty = not turtle.detectDown()
        success = digsuccess or belowempty
        if success then
            turtle.suckDown()
            ManageInventory()
            if CanGetHome(distance) then
                turtle.down()
                distance = distance + 1
            else
                print("Cant get home with distance " .. distance .. " and fuel " .. turtle.getFuelLevel())
                break
            end
        else
            print("Cant dig down anymore. So I'm going back up")
        end
    until(success == false)

    print("Going home")
    for i = 1,distance,1 do
        turtle.up()
    end
end

Quarry()