This is a very broad question. There are references to silver in many poems - are you looking for a poem that refers to silver, one about silver as in the element, one about silver as a reference to age or experience, one about silver coins, or some other situation? It would have been helpful if you had provided more specific information about the subject of your search. However, here are some possibilities.
"Silver" (http://www.poemhunter.com/poem/silver/) by Walter de la Mare refers to the silver moonlight falling on various objects. "The Silver Swan" (http://holyjoe.org/poetry/gibbons.htm) by Orlando Gibbons is the dying song of a swan. Poems about the element silver can be found at (http://www.everypoet.net/element/display.php?symbol=Ag).
I found some very interesting poems that has the title, 'Silver'. Some refer to the metal silver. Others act as an description or symbolic picture of something silver. One of my favorite poems I got from a teen website is as follows:
Someone I thought I left comes back to me.
The one I rejected that held me when no one else would.
Now I know we are bound for eternity.
I hold her hand as we close our eyes.
I hold my breath as silver lips kiss me.
Leaving stains of red.
when we part I stare into the eyes of my steel maiden and sigh.
meant to be. By Onecalledfreak, Junior member.
Since this is a reference question, I'm assuming you want to know what source I used to locate this poem. I typed in poems with the topic silver. I got a link. I am sharing it with you.
Below is the search listing I found. One site where I found the above poem, was called Family Friends Forums, for Teens.
I hope you find this useful.