The best place I find it is in the North thermal vent in the safe shallows

Sandstone deposits. You find a bunch of them in the kelp forest and the grassy plateaus

around the vines towards the floor and if you find drop offs there's often ore deposits

Only in [BZ]

And copper, too.

They say you can also find chopper

You can actually find silver on Reefbacks. Just look for the bright blue spots on its back (you will receive the prompt to 'break barnacle,' and you will either get copper or silver from it. Just be aware that some Reefbacks can also have Tiger Plants on their backs.

Red Grass areas have easy to find sandstone. You can also find it in some of the areas of the Kelp if you're near one of the deeper areas. You can find it on the high walls around a mushroom forest -- if you've found one of those you've ranged pretty far.

Creepvine forest around there is sandstone chunks with silver gold and lead

Find it in caves and in the area with the red grassy stuff near the ship it's in sandstone circle things like copper is in the limestone things. You get gold lead silver

Sandstone outcrops in the kelp forest, grassy plains, and caves in the safe shallows. Also the large blue barnacles on top of Reefback leviathans.

Arctic Kelp Caves, there are gold and silver deposits there.

There is also a bunch in the thermal spires zone. If you do not mind bonesharks. I made a scanner in that area and it helped a ton, especially if you get some magnesium

Silver will spawn with cobalt or gold, iirc. If you find cobalt or gold, silver might be nearby, though you are also likely to find gold + iron or cobalt + iron + nickel + silicon

Just keep searching using a Large Grid Ore Detector, looking for "ore spots". You can find them under ice, like in the image, but also under normal terrain with white-yellowish spots

Could be silver, could be cobalt. It will be ore though.

Ore detector max distance

silver & gold, usually

Got a drill? Plenty of silver hunks in the dunes and at the bottom of the underwater islands. I think there's also one not that far off the shore of spoiler mountain?

If not, start looking for reefbacks.

On the walls on crevices in the seeweed forests or strewn around the great white plains with red seaweed.

I assume you were in the kelp forest You can find sandstone chunks in the caves ther or outside a few on walls (similar to limestone)

Sandstone in the kelp or grassy plateaus. Or, barnacles on reef backs.

Go deeper.

These other comments are great, but you can find sandstone in the coral caves in the safe shallows. Just be careful not to get lost and run out of air in the caves.

Depends how deep you can go under my main base there’s quite a few of them and uranium too. But you will need a drill to harvest them.

In the red grass area, ( I forgot what it was called ) look for the large pillars on them, there should be a 2-4 outcrops per pillar

Never enough silver.