I am making a mining game but I cant figure out how to mine a block below me! How do I do this?

What I need: I am using OnTouch as my way to break blocks, and using the classic ROBLOX slash animation, but I want to hover over a block with the pickaxe tool, and whenever the tool is activated, the block will lose health. I am also using a GUI that is shown to the player whenever they hit the block. This GUI shows the rock health. All I need is a way to hover over a block in-range and be able to break it when my pickaxe is activated. Any help would be appreciated!

Tool Code

local tool = script.Parent

local function mine()
    local str = Instance.new("StringValue")
    str.Name = "toolanim"
    str.Value = "Slash"
    str.Parent = tool
    tool.Mining.Value = true
    wait(0.5)
    tool.Mining.Value = false
end

tool.Activated:Connect(mine)

Mineable Rock Code

local rock = script.Parent
local swingsRemaining = 10
local rockpos = script.Parent.Position

local rs = game:GetService('ReplicatedStorage')
local ss = game:GetService('ServerStorage')
local ores = rs:WaitForChild('Ores'):GetChildren()
local once = true
local i = ''
local function onTouch(op)
    local tool = op.Parent
    if tool:IsA('Tool') and tool.Mining.Value == true then
        if once == true then
            local label = game:GetService('ServerStorage').HealthScreen:Clone()
            local plrpress = game:GetService('Players'):GetPlayerFromCharacter(op.Parent.Parent)
            label.Parent = plrpress.PlayerGui
        end
        once = false
        script.Hit:Play()
        swingsRemaining-=1
        game:GetService('Players'):GetPlayerFromCharacter(op.Parent.Parent).PlayerGui.HealthScreen.Health.Green.Size = UDim2.new(swingsRemaining/10, 0,0.5,0)
    end
    if swingsRemaining <= 0 then
        dropOres(math.random(1,3))
        rock:Destroy()
    end
end

function dropOres(amount)
    for i = 1,amount do
        local rndmOre = ores[math.random(1,#ores)]:Clone()
        local cs = ss:WaitForChild('Collect'):Clone()
        rndmOre.Parent = workspace
        rndmOre.Position = rock.Position
        cs.Parent = rndmOre
    end
end
rock.Touched:Connect(onTouch)