Key Features

• Replaces the vanilla Mining Productivity technology
• Default maximum level: 20
• Maximum effect: up to 100× more total ore
  (ores are not infinite)
• Reaching the max level effectively multiplies ore yield by ×100
• Miner speed is affected by quality:
  1 + (level × 0.3)
• Quality does not affect the resource drain percentage
• Research cost scales with power of 3 in the late game
  The closer you get to the max level, the more effective each level becomes
  (extra levels exist mainly to increase difficulty)

Gameplay Impact

• Solves the issue where mining productivity makes drills insanely fast
• Mining drills must actually work — large ore patches matter again
• Makes oil extraction relevant in the late game
• Makes productivity modules in mining drills meaningful
• Design proper beaconed mining setups
• Productivity is multiplicative
• At max level, +100% productivity results in ×200 total ore
• This is a nerf to mining drill speed, but a buff to mining productivity
• Productivity can scale up to level 1000
• Costs may be adjusted later (currently likely too cheap)

Technical Notes

• Removes the vanilla Mining Productivity technology by default
• UPS impact is almost zero
• Only runs on research completion (O(n))
• Or when an entity is built (O(1))
• Still beta and not fully tested
  Known issue: https://forums.factorio.com/viewtopic.php?t=132058

Commands

• /mdrd_unresearch
  Before removing the mod, Prevents mining drills from disappearing.
• /mdrd_refresh
  If some mining drills do not upgrade

Links

• [Original brainstorming discussion](https://forums.factorio.com/viewtopic.php?p=680668&hilit=resource+drain#p680668]