Gem Mine

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"Gem Mines access a rare deposit of this highly valuable resource! Mining gems is slow and hard work."

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Ruin	Level 1	Level 2	Level 3

Level 4	Level 5	Level 6	Level 7	Level 8'

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• Summary
  • The Gem Mine can be unlocked in the Builder's Base. It requires Builder's Hall level 3 to be repaired.
  • The Gem Mine, as its name suggests, produces gems, albeit very slowly. These mined Gems are then stored until the player collects them or the storage fills.

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• Upgrade Differences
  • Gem Mines undergo a significant visual change at level 3.
    • In its initial ruined state, it appears as a derelict, overgrown cave. A Gem insignia on a wooden hexagon on the side of the rocks can be found on the Mine's side. There are large broken wooden planks covering the entrance, and a broken box. There are also Gems scattered around the Mine.
    • When reconstructed, the Gem Mine is a cave-like structure with a wooden arch supported by ropes at the entrance. The Gem insignia is present on the side of the Mine, and a rail conveyor extends out of the cave, into a box containing Gems. Outside the cave is a torch.
    • At level 2, the Gem Mine's arch and base is reinforced by metal.The grass on the side of the Gem Mine has disappeared.
    • At level 3, the top of the cave is replaced by an open roof and a pulley system. More wooden planks are added to the sides of the opened roof, in order to support the pulley. Additional reinforcing metal plates appear at the top of the entrance.
    • At level 4, the reinforcing metal plates change to a bronze-colored scheme. A second pulley is also added.
    • At level 5, the reinforcing wooden structure now extends to the back of the cave, and additional bronze plates are added to the back side of the roof.
    • At level 6, the pulley system becomes bronze, with wood covering the roof.
    • At level 7, a bar is fixed to the roof, and it now suspends the pulley system. Ropes can be seen between the two pulleys, and the roof now appears to be made of stone.

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• Defensive Strategy
  • This building serves no purpose on defense, so placing it on the outside to protect your defenses can be good.
  • Placing it in the corner can stall your opponent from getting three stars on your base.
  • This building has low hitpoints, so it is better to place it outside of the walls or the base.

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• Trivia
  • The Gem Mine is the only building that produces Gems.
  • There are no storages for the Gems except for the Gem Mine due to your unlimited Gem inventory.
  • Unlike the Gold Mine, there is no cart that delivers the Gems to the surface, instead, a conveyor belt delivers the Gems to the surface.
  • When the Gem Mine is full, the Gems are in a large, unorganized pile right outside the entrance of the Gem Mine.

Icon Descriptions

	Tapping this icon displays information about the Gem Mine, such as Level, Capacity, Production and Hitpoints.
	Tapping this icon begins upgrading the Gem Mine to the next level, if you have enough resources and a free Master Builder or O.T.T.O. When the Gem Mine is at maximum level, this icon is not shown.
	Tapping this icon instantly upgrades the Gem Mine to the next level, at the cost of one Hammer of Building if you have one. When the Gem Mine is at maximum level, or the Builder Hall requirements for the next level are not met, this icon is not shown.
	Tapping this icon, which is displayed only while an upgrade is in progress, instantly finishes that upgrade at the cost of the displayed number of Gems.
	Tapping this icon, which is displayed only while an upgrade is in progress, instantly finishes that upgrade at the cost of one Book of Building. This icon is only shown if you have at least one Book of Building.
	Tapping this icon, which is displayed only while an upgrade is in progress, instantly finishes that upgrade at the cost of one Book of Everything. This icon is only shown if you have at least one Book of Everything but do not have a Book of Building.
	Tapping this icon, which is displayed only while an upgrade is in progress, cancels the current upgrade and refunds half of the upgrade cost.

Number Available	Builder Hall Level
	1	2	3	4	5	6	7	8	9	10
Total	0	0	1	1	1	1	1	1	1	1

Size
3x3

Level	Build Cost	Build Time	Experience Gained	Capacity	Production Rate (per day)*	Production Time per Gem	Time to Fill	Catch-up Point**	Hitpoints	Builder Hall Level Required
1	120,000	1 hr	60	10	2.16	11h 6m 40s	4d 15h 6m 40s	N/A	300	3
2	180,000	2 hr	84	11	2.40	10h	4d 14h	18h	345	3
3	240,000	6 hr	146	12	2.64	9h 5m 27s	4d 13h 5m 27s	2d 12h	397	4
4	450,000	8 hr	169	13	2.88	8h 20m	4d 12h 20m	3d 16h	457	4
5	1,000,000	10 hr	189	14	3.12	7h 41m 32s	4d 11h 41m 32s	5d	526	5
6	1,500,000	12 hr	207	16	3.36	7h 8m 34s	4d 18h 17m 9s	6d 12h	605	6
7	2,500,000	1 day	293	18	3.84	6h 15m	4d 16h 30m	7d	696	7
8	3,500,000	2 day	?	20	4.3	5h 35m 53s	?	?	?	8

* These values are exact values that are derived from the game files. In-game, this statistic is rounded down to one decimal place.

** The Catch-Up Point is the time at which the newly upgraded Gem Mine has equaled the total production of the mine had it not been upgraded - this does not consider recovering the cost of the Builder Elixir required to perform the upgrade.

Caveat: The Catch-Up Point calculation assumes that the player collects all resources from the Gem Mine without allowing it to reach its storage capacity, as resource production ceases at that point. If the player is unable to regularly collect and achieve the full potential of the collector, the Catch-Up Point is actually shorter and performing the upgrade becomes more advantageous.

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