There are two mines in FOMT the spring mine and the lake mine.
Spring Mine-
The spring mine is found near the goddess pond on mothers hill. It is accessible all year long. It is 255 levels deep and the following can be found in the mine.
Adamantine Floor 10 and below
Copper All floors
Teleport Stone Floor 255, only after 3rd year
Recipe How to cook French Fries, Floor 255
Goddess Jewel Floors 60, 102, 123, 152, 155, 171, 190, 202, and 222
Gem of the Goddess Receive after collecting 9 Goddess Jewels
Gold Level 3 and below
Mystrile Floor 5 and below
Orichalc Floor 10 and below
Power Berry Floor 100
Mythic Stones Floor 60
Silver All floors
Lake Mine-
The lake mine is about halfway up mothers hill and can be found only in the winter when the lake has frozen over. Cursed tools can be found in this section plus other things. I will list the location of the cursed tools here but for more information check the tools section. Remember that if your tool is not at Mystrile these will not appear.
Cursed Fishing Rod Floor 29
Cursed Hoe Floor 39
Cursed Ax Floor 49
Cursed Hammer Floor 59
Cursed Watering Can Floor 69
Cursed Sickle Floor 79
Everything else found in the mine is below
Agate All floors except 50, 100, 150, and 200
Alexandrite Floors 50, 100, 150, 200, 251 and below
Amethyst All floors except 50, 100, 150, and 200
Diamond Floors that end in 0 (10, 20, 30, 40, etc.)200+
Emerald Floors that end in 5 (5, 15, 25, 35, etc.) 200+
Flourite All floors except 50, 100, 150, and 200
Kappa Jewels Floors 0, 40, 60, 80, 120, 140, 160, 180, and 255
Gem of the Kappa Receive from Kappa after collecting all 9 jewels
Moon Stone Floors that end in 8 (8, 18, 28, 38, etc.)
Period All floors except 50, 100, 150, and 200
Pink Diamond Floors 30, 70, 90, 110, 130, 170, 190, 255
Ruby All floors except 50, 100, 150, and 200
Sand Rose Floors that end in 9 (9, 19, 29, 39, etc.)
Topaz All floors except 50, 100, 150, and 200