Exhibit 16.1

Mine safety disclosure, as required
by Section 1503 of the Dodd-Frank Wall Street Reform and Consumer Protection Act (“Dodd-Frank”)

Atna Resources Ltd. and Subsidiaries
— January through December 2011



|                        |  |           |    |  |         |  |   |           |  |  |            |  |  |         |   |  |              |  |   |            |  |   |            |  |  | Received  |   |  |         |  |    |           |  |  |          | 
|----------------------- |  | --------- | -- |  | ------- |  | - | --------- |  |  | ---------- |  |  | ------- | - |  | ------------ |  | - | ---------- |  | - | ---------- |  |  | --------- | - |  | ------- |  | -- | --------- |  |  | -------- | 
|                        |  |           |    |  |         |  |   |           |  |  |            |  |  |         |   |  |              |  |   |            |  |   | Received   |  |  | Notice of |   |  | Legal   |  |    |           |  |  |          | 
|                        |  |           |    |  |         |  |   |           |  |  |            |  |  |         |   |  |              |  |   | Total      |  |   | Notice of  |  |  | Potential |   |  | Actions |  |    |           |  |  |          | 
|                        |  |           |    |  |         |  |   | Section   |  |  |            |  |  |         |   |  | Total Dollar |  |   | Number     |  |   | Pattern of |  |  | to Have   |   |  | Pending |  |    | Legal     |  |  | Legal    | 
|Mine or                 |  |           |    |  |         |  |   | 104(d)    |  |  |            |  |  |         |   |  | Value of     |  |   | of         |  |   | Violations |  |  | Pattern   |   |  | as of   |  |    | Actions   |  |  | Actions  | 
|Operating               |  | Section   |    |  | Section |  |   | Citations |  |  | Section    |  |  | Section |   |  | MSHA         |  |   | Mining     |  |   | Under      |  |  | Under     |   |  | Last    |  |    | Initiated |  |  | Resolved | 
|Name/MSHA               |  | 104S&S    |    |  | 104(b)  |  |   | and       |  |  | 110(b)(2)  |  |  | 107(a)  |   |  | Assessments  |  |   | Related    |  |   | Section    |  |  | Section   |   |  | Day of  |  |    | During    |  |  | During   | 
|Identification          |  | Citations |    |  | Orders  |  |   | Orders    |  |  | Violations |  |  | Orders  |   |  | Proposed     |  |   | Fatalities |  |   | 104(e)     |  |  | 104(e)    |   |  | Period  |  |    | Period    |  |  | Period   | 
|Number                  |  | (#)       |    |  | (#)     |  |   | (#)       |  |  | (#)        |  |  | (#)     |   |  | ($)          |  |   | (#)        |  |   | (yes/no)   |  |  | (yes/no)  |   |  | (#)     |  |    | (#)       |  |  | (#)      | 
|Briggs Mine ID 0405276  |  |           | 14 |  |         |  | 0 |           |  |  | 0          |  |  |         | 0 |  |              |  | 0 |            |  | $ | 36,099     |  |  |           | 0 |  |         |  | NO |           |  |  | NO       | 
|Pinson Mine ID 26-01597 |  |           | 0  |  |         |  | 0 |           |  |  | 0          |  |  |         | 0 |  |              |  | 0 |            |  |   | 0          |  |  |           | 0 |  |         |  | 0  |           |  |  | 0        |