My ores are not adding money to the leaderboard?

When you set a variable to a ValueObject's Value property, that variable becomes equivalent to what the Value was when the script executed that line of code.

By changing the variable, you are simply changing the variable. The ValueObject's value is not affected.

You need to reference the object from the variable, and index the property to set it.

Now, secondly, you are getting the Player incorrectly. Since this is a server script you cannot use game.Players.LocalPlayer. You need to get the player some other way. That way is up to you. Preferably by an 'owner' StringValue to the tycoon.

local plr --This is the player.
local worth = plr:WaitForChild("leaderstats"):WaitForChild("Money")

function destroy(hit)
    if hit.Name == "drop" then
        worth.Value = worth.Value + 10
        hit:Destroy()
    end
end

script.Parent.Touched:connect(destroy)

I'm just gonna fix this, upvote and accept answer if worked

In a local script;

local player = game.Players.LocalPlayer
local Value = 10 -- the value of the ore
local curreny = player:WaitForChild("leaderstats").Money.Value
local Furnace = script.Parent --The furnace
local Cashed = false --make debounce so the player doesn't get a lot of 10 money

Furnace.Touched:connect(function(Hit)
    wait() --Dunno why
    if Hit.Parent.Name == "Drop" then
        Cashed = true
        wait() -- Dunno why
        currency = currency + Value
        Hit.Parent:Destroy()
        wait() -- Dunno why
        Cashed = false
        if Cashed then return end -- We don't want the player to get too much money
    end
end)

Try, comment, ask and explain.

Don't use a LocalScript!

LocalScripts don't work in workspace unless they're in a player character. Also, if FE was enabled, the local scripts would only affect the value locally, which you obviously don't want!

The next problem is you need to get the player. But which player? That's something you need to figure out, but I'll provide an example. By touching the ownerBrick, you become the owner of this tycoon.

local owner

local debounce = false
local function destroy(hit)
    if owner and not debounce and hit.Name == "drop" then
        debounce = true
        local worth = owner.leaderstats.Money
        worth.Value = worth.Value+10
        hit:Destroy()
        wait(.5)
        debounce = false
    end
end
script.Parent.Touched:Connect(destroy)

local ownerBrick = script.Parent.Parent:WaitForChild("OwnerBrick")
ownerBrick.Touched:Connect(function(hit)
    local plr = game.Players:GetPlayerFromCharacter(hit.Parent)
    if((plr)and(not owner))then
        owner = plr
    end
end)

game.Players.PlayerRemoving:Connect(function(plr)
    if(plr ==  owner)then
        owner = nil
    end
end)

This is the solution. You need to have the .value after the 'worth' value. Then it will work.

local plr --This is the player.
local worth = plr:WaitForChild("leaderstats"):WaitForChild("Money")

function destroy(hit)
    if hit.Name == "drop" then
        worth.Value = worth.Value + 10
        hit:Destroy()
    end
end

script.Parent.Touched:connect(destroy)