In DORAEMON STORY OF SEASONS: Friends of the Great Kingdom, you can begin mining by first obtaining an Old Pick. To do this, complete the first of the Smithy's events. This first event will unlock another one called Getting a Pick.

Visit Gidal some time after that and he'll give you the pickaxe. With that settled, head to the northwest corner of the map and enter the mines. At first, you will be locked to the first set of floors and only later will you be able to reach the deeper floors, once you upgrade your pickaxe.

Next, we will show you every item you can find on each floor of the mines along with its drop rate, that is, the rate at which items will appear. We've determined this by running the mines a few times so it will not be 100% accurate, but you can get an idea of which are the most common and rare items.

 

Mine Entrance

Entrance
Item	Drop Rate	Sell Price
Building Stone	21.05%	10
Copper Ore	28.95%	20
Metal Scrap	7.90%	100

 

B1F

In the first level, you will start seeing Iron Ore and Fern Fosil.

B1F
Item	Drop Rate	Sell Price
Building Stone	37.14%	10
Copper Ore	42.86%	20
Metal Scrap	2.86%	100
Iron Ore	14.29%	30
Fern Fossil	2.86%	120

B2F

Silver Ore is introduced on this floor, but Copper Ore becomes less common. Consider grinding the previous floor if you're in need of Copper Ore.

B2F
Item	Drop Rate	Sell Price
Building Stone	31.43%	10
Copper Ore	25.71%	20
Metal Scrap	2.86%	100
Iron Ore	28.57%	30
Fern Fossil	8.57%	120
Silver Ore	8.57%	50

B3F

This might be due to insufficient data, but I've seen fewer items in B3F than in B2F.

B3F
Item	Drop Rate	Sell Price
Building Stone	13.51%	10
Copper Ore	24.32%	20
Metal Scrap	5.41%	100
Iron Ore	29.73%	30
Silver Ore	2.70%	50

B4F

Gold Ore is finally introduced on this floor. You'll also find Trilobite and Nautilidae fossils.

B4F
Item	Drop Rate	Sell Price
Copper Ore	35.14%	20
Metal Scrap	2.70%	100
Iron Ore	16.22%	30
Fern Fossil	5.41%	120
Silver Ore	16.22%	50
Gold Ore	2.70%	80
Nautilidae	5.41%	80
Trilobite	5.41%	80

B5F

Similar to the previous one, but Steg-o-plate will also drop here.

B5F
Item	Drop Rate	Sell Price
Copper Ore	18.92%	20
Iron Ore	27.03%	30
Fern Fossil	2.70%	120
Silver Ore	29.73%	50
Gold Ore	2.70%	80
Nautilidae	2.70%	80
Trilobite	5.41%	80
Steg-o-plate	2.70%	180

B6F

Gold Ore becomes far more common here. You'll also find T-Rex Fossil, Raptor Claw and Amber.

B6F
Item	Drop Rate	Sell Price
Copper Ore	18.42%	20
Iron Ore	18.42%	30
Fern Fossil	2.63%	120
Silver Ore	23.68%	50
Gold Ore	18.42%	80
Nautilidae	2.63%	80
T-Rex Fossil	5.26%	180
Raptor Claw	5.26%	180
Amber	5.26%	720

B7F

The drop rate of Gold Ore continues to be the same here, but I didn't see any gem drops as on the previous floor. Instead, a new fossil called Triceratops Fossil will drop ehere.

B7F
Item	Drop Rate	Sell Price
Copper Ore	14.49%	20
Iron Ore	18.84%	30
Fern Fossil	1.45%	120
Silver Ore	31.88%	50
Gold Ore	18.84%	80
Nautilidae	1.45%	80
Triceratops Fossil	5.80%	240
Steg-o-plate	2.90%	180

B8F

We finally start seeing some more gems on this floor. You can find Ruby, Diamond and Amber.

B8F
Item	Drop Rate	Sell Price
Copper Ore	10.14%	20
Iron Ore	27.54%	30
Fern Fossil	1.45%	120
Silver Ore	15.94%	50
Gold Ore	17.39%	80
Nautilidae	1.45%	80
T-Rex Fossil	4.35%	180
Raptor Claw	5.80%	180
Amber	5.80%	720
Diamond	2.80%	300
Ruby	1.45%	180
Triceratops Fossil	5.80%	240

B9F

Gems Emerald and Sapphire first dropped on this floor for all my runs and gems seem to be the most common on this floor.

B9F
Item	Drop Rate	Sell Price
Copper Ore	15.94%	20
Iron Ore	18.84%	30
Fern Fossil	1.45%	120
Silver Ore	24.64%	50
Gold Ore	15.94%	80
Nautilidae	1.45%	80
T-Rex Fossil	4.35%	180
Diamond	5.80%	300
Amber	10.14%	720
Ruby	7.25%	180
Sapphire	5.80%	180
Emerald	1.45%	180
Steg-o-plate	2.90%	180

Crystal Lake

At the bottom of the mines, you will find the Crystal Lake where you can call for a creature called Beruga. If you offer it fish, it will give you more fish in return. I am not sure of how the reward system works, but my guess is that the rarer and better quality fish you gave it, the better the rewards.

You can fish in this lake. Here are the fish that I was able to catch. They were all caught with an Old Fishing Rod.

Fish	Season
Seahorse	Spring
Pocket Shark	Spring
Goblin Shark	Spring
Barreleye	Spring
Hagfish	Spring
Careproctus	Spring
Horseshoe Crab	Spring
Bathynomus Giganteus	Spring
Umbrella Octopus	Spring