Rupie Mine

Rupie Mine

Description

A facility for mining rupies from the earth. Shipments arrive in regular intervals, providing a great source of easy income!

Facility Type

Production

Size

3x3

Available

Obtained From

Release Date

July 23, 2026

Short Summary

The Rupie Mine collects Rupies at set intervals and stores them up to a limit.
Two Rupie Mine are immediately available, and a 3rd and 4th mine can be built at Player Lv. 22 and 34, respectively.

Upgrade Table

Level	Prod. Time	Limit	Cost	Materials Required	Build Time	Payback PeriodSee "Payback Period" section for explanation
1	6 hr	800	50	—	3 sec	0.25 days
2	6 hr	850	100	—	30 sec	0.5 days
3	6 hr	900	150	—	1 min	0.75 days
4	6 hr	950	200	—	3 min	1 days
5	6 hr	1,000	250	—	5 min	1.25 days
6	6 hr	1,050	300	x1	10 min	1.5 days
7	6 hr	1,100	350	x1	20 min	1.75 days
8	6 hr	1,150	400	x1	40 min	2 days
9	6 hr	1,200	500	x2	1 hr	2.5 days
10	6 hr	1,250	600	x2	2 hr	3 days
11	6 hr	1,300	700	x3	3 hr	3.5 days
12	6 hr	1,350	800	x3	4 hr	4 days
13	6 hr	1,400	900	x3	5 hr	4.5 days
14	6 hr	1,450	1,000	x5	6 hr	5 days
15	6 hr	1,500	1,100	x5	7 hr	6.75 days
16	6 hr	1,550	1,200	x8, x1	8 hr	8.583 days
17	6 hr	1,600	1,400	x8, x1	10 hr	12.333 days
18	6 hr	1,650	1,600	x8, x1	12 hr	16.25 days
19	6 hr	1,700	1,800	x10, x1	14 hr	20.333 days
20	6 hr	1,750	2,000	x10, x1	16 hr	24.583 days
21	6 hr	1,800	2,200	x15, x2	18 hr	29 days
22	6 hr	1,850	2,400	x15, x2	20 hr	33.583 days
23	6 hr	1,900	2,600	x15, x2	22 hr	38.333 days
24	6 hr	1,950	2,800	x20, x2	24 hr	43.25 days
25	6 hr	2,000	3,000	x20, x2	28 hr	51.667 days
26	6 hr	2,050	3,200	x30, x3, x1	32 hr	60.417 days
27	6 hr	2,100	3,400	x30, x3, x1	36 hr	69.5 days
28	6 hr	2,150	3,600	x30, x3, x1	40 hr	78.917 days
29	6 hr	2,200	3,800	x40, x3, x1	44 hr	88.667 days
30	6 hr	2,250	4,000	x40, x3, x1	48 hr	98.75 days
Total			46,400	x325, x30, x5	16.7 days	—

Payback Period

The time it takes for each level of the Rupie Mine to pay itself off based on its improved earnings can be calculated with the following formula.

PaybackPeriod[hr] = BreakEvenTime[hr] + max(BuildTime[hr]-6[hr],0)

where

BreakEvenTime[hr] = (UpgradeCost[rup]+LostIncome[rup]) / (50[rup]/6[hr])

with Lost Income defined as

LostIncome[rup] = (PrevProductionLimit[rup]/6[hr]) * max(BuildTime[hr]-6[hr],0)

The Break Even Time formula calculates the time it takes to recover the cost of the upgrade AND the lost income during construction at that level's increased income rate (always 50). The max() function rejects negative numbers, representing the fact that rupies are only lost when the build time exceeds 6 hours. The Build Time is added in the Payback Period formula to account for the period of time where the Rupie Mine does not produce any rupies after hitting its limit during construction.

The payback period of one level has no effect on the payback period of another level. They are all independent, and some can occur simultaneously.