Mountain out of a molehill, but like in a good way
Have 600 mines.
Never dig down
Make 1 quadrillion cookies just from mines.
Make 10 sextillion cookies just from mines.
Make 100 octillion cookies just from mines.
Reach level 10 mines.
Own 1 mine
Mines are twice as efficient. "A pink, volatile gas, found in the depths of some chocolate caves."
Own 5 mines
Mines are twice as efficient. "You're in deep."
Own 25 mines
Mines are twice as efficient. "Finally caved in?"
Own 50 mines
Mines are twice as efficient. "Pierce the heavens, etc."
Own 100 mines
Mines are twice as efficient. "Questionable efficiency, but spectacular nonetheless."
Own 150 mines
Mines are twice as efficient. "You've finally dug a tunnel down to the Earth's core. It's pretty warm down here."
Own 200 mines
Mines are twice as efficient. "These new state-of-the-art excavators have been tested on Merula, Globort and Flwanza VI, among other distant planets which have been curiously quiet lately."
Canola oil wells
Own 250 mines
Mines are twice as efficient. "A previously untapped resource, canola oil permeates the underground olifers which grant it its particular taste and lucrative properties."
Own 300 mines
Mines are twice as efficient. "Engineered from real human beings within your very labs, these sturdy little folks have a knack for finding the tastiest underground minerals in conditions that more expensive machinery probably wouldn't survive."
Own 350 mines
Mines are twice as efficient. "These aren't used for anything freaky! The miners just enjoy having a pet or two down there."
Own 400 mines
Mines are twice as efficient. "After extracting so much sediment for so long, you've formed some veritable mountains of your own from the accumulated piles of rock and dirt. Time to dig through those and see if you find anything fun!"
Own 450 mines
Mines are twice as efficient. "You've dug your drills through just about every solid surface you could find. But did you know recent advances have revealed untold riches hiding within non-solid surfaces too?"
Own 500 mines
Mines are twice as efficient. "Your geologists have isolated a family of once-overlooked sugary ores that, when combined, may be turned into even more cookie ingredients. Your millions of miles of previously useless tunnels probably house insane amounts of the stuff!"
15 mines and 1 grandma owned
Grandmas are twice as efficient. Mines gain +1% CpS per 2 grandmas. "A nice miner to dig more cookies."
15 Mines, 15 Wizard towers and "Synergies Vol. I" purchased
Mines gain +5% CpS per wizard tower. Wizard towers gain +0.1% CpS per mine. "Surprise earthquakes are an old favorite of wizardly frat houses."
75 Mines, 75 Shipments and "Synergies Vol. II" purchased
Mines gain +5% CpS per shipment. Shipments gain +0.1% CpS per mine. "As per the 1974 United Cosmic Convention, comets, moons, and inhabited planetoids are no longer legally excavatable. But hey, a space bribe goes a long way."
15 Mines, 15 Shipments and "Synergies Vol. I" purchased
Mines gain +5% CpS per shipment. Shipments gain +0.1% CpS per mine. "Somehow better than plutonium for powering rockets. Extracted from the fuels of ancient, fossilized civilizations."
15 Mines, 15 Alchemy labs and "Synergies Vol. I" purchased
Mines gain +5% CpS per alchemy lab. Alchemy labs gain +0.1% CpS per mine. "Only when refining the purest metals will you extract the sweetest sap of the earth."
15 Mines, 15 Chancemakers and "Synergies Vol. I" purchased
Mines gain +5% CpS per chancemaker. Chancemakers gain +0.1% CpS per mine. "Good-luck charms covered in ancient and excruciatingly rare crystals. A must have for job interviews!"
Random fortune from news ticker
Mines are 7% more efficient and 7% cheaper. "Riches from deep under elevate you all the same."
In Cookie Clicker Classic
Two images from the Classic version, left: icon shown in the store, right: appearance in the middle field
The mine is the fourth item you can purchase. It will give you 50 cookies every 5 seconds.
It costs 2,000 cookies to start and will increase by 15% with each consecutive purchase.
Buying your first mine will increase Grandma output by +2 cookies per 5 seconds. It will also cause some grandmas to don brown miner uniforms.
In Cookie Clicker Classic, the mines were unlocked after the factories, but in cookie clicker update 1.0 this was changed the other way around.
The ultimadrill upgrade's flavour text, "Pierce the heavens, etc." is a reference to the anime Gurren Lagann, where lines such as "Your drill is the drill that will pierce the heavens!" are said several times.
It would cost a total of 91.93 quadrillion cookies to get the 200 mines necessary for the "Coreforge" upgrade, the last 20 mines representing 94% of that total cost.
Never Dig Down is a reference to Minecraft where digging straight down can lead to death by lava or other hazards.
The upgrade "H-Bomb Mining" is a reference to "Operation Plowshare" - A series of experiments by the US military to find non-combative uses for nuclear weapons. Unsurprisingly, testing proved that nukes were good for many things, mining however not being one of them.
The achievement "Hey now, you're a rock" is a reference to the song "All Star" by Smash Mouth, where part of the chorus is "Hey now, you're a rock star".