The Quarry Junction is a limestone quarry used to produce cement for the New California Republic. After Powder Gangers stole the dynamite used by the workers there, they returned to Sloan awaiting more help from the NCR. While being away from the quarry, it was overrun by a vast number of deathclaws, stopping workers from continuing to supply the NCR.
The rest of the quarry has natural borders made of large mountains and limestone deposits that prevent entry. The workers and residents of Sloan have even posted signs near the quarry warning travelers that there are deathclaws in that area, even as far as Goodsprings Cemetery.
There are many deathclaws guarding both entrances, and the inside is flooded with even more. There are also young deathclaws, a deathclaw alpha male, and the deathclaw mother with her litter of babies. She's walking around at the back of the quarry near an unmarked location, "the matriarch's den".
The deathclaws, mother deathclaw and deathclaw alpha male are variants of the regular ones found in the Mojave, with double to triple health and a much more powerful attack.
Even after you kill the deathclaw alpha male and deathclaw mother, any remaining deathclaws will remain there for a couple of in-game days.
Once the area is clear of deathclaws, bark scorpions occasionally appear in Quarry Junction.
Even after the area has been cleared of deathclaws, it is not unusual for a lone deathclaw to spawn on the outskirts of the quarry.
If the deathclaw mother and/or alpha male are killed in a way not affording the player EXP (e.g. killing them with dynamite dropped on the ground to bolster a powder charge), that kill still counts towards solving the quest Claws Out.