This guide will let you know how to find Tin to Mine in Valheim. You will need to follow the steps in this guide to find Tin.
You can only find the Tin in the Black Forest; you have to go to the top right side of the Black Forest in Meadows, as shown in the image below.
You can easily find these stones around the area; you can also find these tins at the ocean side. The shiny stones are the tin deposit; you have to mine it with your pickaxe, break it by hitting it five to six times and get 3 to 4 tins.
Some of the tools that you craft from tin are not made from tin. You will need 2 coopers and 1 tin to make one bronze.