Ore

function isOre(mod)
    mod = mod or ""
    local success, data = turtle["inspect"..mod]()
    if success and string.find(string.lower(data.name),"ore") then
        print(data.name)  --  ore name (minecraft:redstone_ore, or something like that)
        return true
    end
    return false
end

function mineOre(dir,tStack)
    dir = dir or "forward" --will only be forward, top, or bottom
    tStack = tStack or {}

    local level = 0
    if dir == "top" then
        turtle.digUp()
        turtle.up()
        table.insert(tStack,"up")
        level = level + 1
    elseif dir == "bottom" then
        turtle.digDown()
        turtle.down()
        table.insert(tStack,"down")
        level = level + 1
    elseif dir == "forward" then
        turtle.dig()
        turtle.forward()
        table.insert(tStack,"forward")
        level = level + 1
    end

    if isOre("Up") then
        print("Spawning top instance")
        mineOre("top",tStack)
    end
    if isOre("Down") then
        print("Spawning bottom instance")
        mineOre("bottom",tStack)
    end
    if isOre() then
        print("Spawning forward instance")
        mineOre("forward",tStack)
    end
    for i=1,3 do
        turtle.turnLeft()
        table.insert(tStack,"left")
        level = level + 1
        if isOre() then
            mineOre("forward",tStack)
        end
    end
    turtle.turnLeft()
    table.insert(tStack,"left")
    level = level + 1
    for i=1,level do
        if tStack[#tStack]=="left" then
            turtle.turnRight()
        elseif tStack[#tStack]=="forward" then
            turtle.back()
        elseif tStack[#tStack]=="up" then
            turtle.down()
        elseif tStack[#tStack]=="down" then
            turtle.up()
        end
        table.remove(tStack,#tStack)
    end
end
mineOre()