function on_resource_depleted(event)
  local entity = event.entity

  if entity.initial_amount ~= nil then
    -- Infinite Resource
    return
  end

  local surface = entity.surface
  local position = entity.position

  local category = entity.prototype.resource_category
  local radius = global.max_mining_drill_radius[category]

  if radius == nil then
    log("max_mining_drill_radius: " .. serpent.block(global.max_mining_drill_radius))
    error("max_mining_drill_radius is not set for category: " .. category)
    return
  end

  local miners = surface.find_entities_filtered({
    area = fmsl.box.center_radius(position, radius),
    type = "mining-drill",
    to_be_deconstructed = false,
  })

  -- two tick delay for dropping product and finding a new resource node
  local target_tick = event.tick + 2

  local add_table = false
  local active_miners = table.remove_key(global.active.mining_drills, target_tick) or {}

  for _, miner in pairs(miners) do
    if miner.has_flag("hidden") then
      goto miner_continue
    end

    add_table = true
    table.insert(active_miners, miner)

    ::miner_continue::
  end

  if add_table then
    global.active.mining_drills[target_tick] = active_miners
    script.on_nth_tick(active_tick, on_active_tick)
  end
end