This isn't really a sentence.
However, if you added the word "please" at the end, it would be acceptable, I think as "a request."
"A minute of silence, please."
I added a few sentences that use this phrase.
Could we have a minute of silence?
http://tatoeba.org/eng/sentences/show/2335869
Let's have a minute of silence.
http://tatoeba.org/eng/sentences/show/2335870
There was a minute of silence, then everybody started screaming.
http://tatoeba.org/eng/sentences/show/2335868
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