Gathering River Sand Not Working ?

[Skogaholmslimpa]

Already have the Glass technology unlocked but for some reason when I try to dig sand from the mounds it cries "Technology Required"

[Apoc]

There is a technology for Sand and Clay which, if I remember correctly, is not linked to glass and probably in another tech tree.

[Kaos]

You unlock clay and sand through the church quest. Not the tech tree.
Make the place pretty (5 skulls) and it unlocks.

[The_Barbeerian]

I must have done something wrong then because I can not gather sand and I dont have any quests for the church

[Skogaholmslimpa]

After getting your graveyard level to 5 you'll become a clerc and have access to the church and it's basement. Talking to the priest again should get you a quest for him that requires you to go fetch 20 clay bowls.

That's when he teaches you how to get sand and clay.

[Jazmina]

When you get the quest to make 20 clay bowls for the cleric thats when you will unlock to dig for sand and clay as well as the option to burn bodies instead of throwing them in river(if they bad)

Edit: saw now the one top of me already wrote about the 20 clay bowls xD