Gold Ore not being able to be mined..?

I have gutted a model of Gold Ore from a friend's map that used to be able to be mined with a pickaxe tool. I'm not sure what happened but they completely broke and cease to work.

Help would be greatly appreciated!

Code for ore that is being mined:

local model = script.Parent
local backup = model:clone()
local value = model.Dead

function breakApart()
	local c = model:GetChildren()
	local v = Vector3.new(math.random(-1, 1), 0, math.random(-1, 1))
	for index, child in pairs(c) do
		if child.Name == "Gold" then
			child:remove()
		end
	end
end

function onDied()
	breakApart()
	wait(3)
	backup.Parent = game.Workspace
	backup:MakeJoints()
	model:remove()
end

value.Changed:connect(onDied)

Code for pickaxe tool:

local damage = 1
local money = 15
local reload = 1.5
local tool = script.Parent
local debounce = true

function getDist(pos, pos2)
	return (pos - pos2).magnitude
end

function message(parent, text, time)
	local m = Instance.new("Message")
	m.Text = text
	m.Parent = parent
	wait(time)
	m:remove()
end

function onButton1Down(mouse)
	local target = mouse.Target

	if target == nil then return end

	if debounce == false then return end

	if target.Parent == nil then return end

	if target.Parent.Name ~= "Mine" then return end

	local player = tool.Parent.Parent

	local char = player.Character

	if player == nil then return end

	local dist = getDist(target.Position, char.Head.Position)

	if dist > 3 then return end

	local treehp = target.Parent.HP
	local treedead = target.Parent.Dead

	if treehp == nil or treedead == nil then return end

	if treehp.Value > 0 then

		treehp.Value = treehp.Value - damage

	elseif treehp.Value < 1 and treedead.Value == false then

		treedead.Value = true
		local cash = player.leaderstats.Gold
		cash.Value = cash.Value + money

	end

	if treedead.Value == false then

		debounce = false

		message(player, "Resting, "..(treehp.Value + 1).." hits to go", reload)

		debounce = true

	end
end

function onSelected(mouse)
	print("Equipped")
	mouse.Button1Down:connect(function () onButton1Down(mouse) end)
end

tool.Selected:connect(onSelected)