I think the "Limited" tag appears when it's sparkly, meaning there are more silver and gold rocks for better chances to get more resources.
I decided to investigate “for science” when the Quarry offered cute essence with the “Limited” sparkles.
2 Gold, one silver, two rubies.
Reward: Some bells (+1,000) and 3 essence.
I’m happy with 3 essence, but I’m not impressed with “Limited”.
I think the "Limited" tag appears when it's sparkly, meaning there are more silver and gold rocks for better chances to get more resources.
I think so too. I get nothing but gold & silver nuggets when it says Limited.