Most sardine cans are made of aluminum and are easily recyclable.
The flat rectangular sardine cans are made of aluminum and the peel off lid is also aluminum and both the lid and the aluminum sardine can is recyclable.
Some other sardine cans are made of tin which is also recyclable.
You can place the sardine cans whether aluminum or tin cans into your recycle bin to be recycled.
All recycling programs should accept tin and aluminum sardine cans.
Aluminum and tin is a very easy to recycle material and tin and aluminum can be recycled millions of times.
So if you have tin cans or aluminum cans you can and should recycle them.