Nov 22 (Reuters) - Vista Gold Corp VGZ.A
* Vista Gold Corp. Enters into atm agreement
* Vista Gold Corp - ATM agreement will remain in full force and effect until earlier of August 31, 2020
* Vista Gold Corp - has entered into an at--market offering agreement with H.C. Wainwright & Co as sales manager
* Vista Gold Corp - ATM agreement has an aggregate gross sales value of up to US$10.0 million