CAN YOU HELP IDENTIFY THIS PHOTO?

Can anyone identify the people in this picture or the event it was taken for

It has something to do with the Cornes family, found amongst family items--but we don't know any details
Any suggestions appreciated to Althea ([email protected])

The info on photo is
50 © 23/5/1912
R Rogers
Waihi

APRIL 2008:
Mystery solved, thanks To Waihi Museum Research Team
It appears in the Book "The Red & The Gold" by Stanley Roche
Pg 64 "The Strike Committee--the ordinary men and women at the heart of  Waihi's resolve."