I have access to a lot of this stuff right now so it could be very good for me
Tevlon - for what its worth - back when I was making a living with recovery & refining PMs silver was my bread & butter (gold & PGMs was the gravy) in other words for every kilo of silver I refined I refined a couple ozt gold & 1/2 - 1 ozt PGMs --- & I refined MANY kilos of silver
one of my bigger sources of silver was the points from magnetic disconnects - disconnects can range in size from LARGE to small - I tore down literally thousands of disconnects to get the points out of them
Some of the "large" disconnects had points in them that weighed as much as 1 ozt per point & there are 12 points per disconnect (so 12 ozt per disconnect) on the other hand some of the smallest disconnects only have 1/4 - 1/3 ozt per disconnect (all 12 points)
The cost of processing points (or silver for that matter) depends on a couple things
First is the cost of nitric acid - if you have to pay a high price for your nitric (like $50 - $80 per liter) you will be lucky to see a profit (& it may actually cost you money) on the other hand I was able to buy may nitric (67%) in a 15 gallon keg for about $7 per gallon (so very cheap)
Keep in mind that it takes "about" 4 times more nitric to dissolve a pound of copper then to dissolve a pound of silver
So a gallon of 67% nitric will dissolve (about) 8 pounds of silver BUT only (about) 2 pounds of copper
So if you if you nip the points from the copper bus bar (as you pictured) & though you have reduced the amount of copper you still have silver plus copper to dissolve which will factor into your nitric consumption
So that brings me to the second thing - with larger points - if you can "de-solder" the points to remove them from the copper (or brass) buss bar you will use less nitric for the rest of the refining process
I had a system for doing this that I posted about years ago - I will "try" to find that & post it again (no promise)
Bottom line - contact points are always worth going after because of there silver value
The question is - are they worth your while (profitable) processing them yourself (nitric cost)
If you have to pay a "high" price for your nitric they are still worth while going after but instead of processing them - just pull them from the disconnect & throw them in a 5 gallon bucket ( you don't need to nip them from the buss bar) when you have a 5 gallon bucket full (or two or three) send them to a refiner that will process them
Kurt