Business and Significant Accounting Policies (Policies)	6 Months Ended
Jun. 30, 2020
Accounting Policies [Abstract]
Business and company formation	Solitario Zinc Corp. (“Solitario,” or the “Company”) is an exploration stage company as defined in Industry Guide 7, as issued by the United States Securities and Exchange Commission (“SEC”). Solitario was incorporated in the state of Colorado on November 15, 1984 as a wholly-owned subsidiary of Crown Resources Corporation ("Crown"). In July 1994, Solitario became a publicly traded company on the Toronto Stock Exchange (the "TSX") through its initial public offering. Solitario has been actively involved in mineral exploration since 1993. Solitario’s primary business is to acquire exploration mineral properties or royalties and/or discover economic deposits on its mineral properties and advance these deposits, either on its own or through joint ventures, up to the development stage. At that point, or sometime prior to that point, Solitario would likely attempt to sell its mineral properties, pursue their development either on its own or through a joint venture with a partner that has expertise in mining operations, or create a royalty with a third party that continues to advance the property. Solitario is primarily focused on the acquisition and exploration of zinc-related exploration mineral properties; however, Solitario will evaluate and acquire other base and precious metal mineral exploration properties. In addition to focusing on its mineral exploration properties and the evaluation of mineral properties for acquisition, Solitario also evaluates potential strategic transactions for the acquisition of new precious and base metal properties and assets with exploration potential or business combinations that Solitario determines to be favorable to Solitario. Solitario has recorded revenue in the past from the sale of mineral properties, including (i) the sale of certain mineral royalty properties to SilverStream SEZC, a private Cayman Island royalty and streaming company (“SilverStream”), for Cdn$600,000 in January 2019 (the “Royalty Sale”), and (ii) the sale in June 2018 of its interest in the royalty on its Yanacocha property. In addition, Solitario has received proceeds from (i) the sale in 2015 of its former interest in Mount Hamilton LLC (“MH-LLC”), the owner of its former Mt. Hamilton project; (ii) the sale of a royalty on its former Mt. Hamilton project and (iii) joint venture property payments. Revenues and / or proceeds from the sale or joint venture of properties or assets, although significant when they occur, have not been a consistent annual source of cash and would only occur in the future, if at all, on an infrequent basis. Solitario currently considers its carried interest in the Florida Canyon project in Peru and its interest in the Lik project in Alaska to be its core mineral property assets. Nexa Resources, Ltd. (“Nexa”), Solitario’s joint venture partner, is expected to continue the exploration and furtherance of the Florida Canyon project and Solitario is monitoring progress at Florida Canyon. Solitario is working with its 50% joint venture partner in the Lik deposit, Teck American Incorporated, a wholly-owned subsidiary of Teck Resources Limited (both companies are referred to as “Teck”), to further the exploration and evaluate potential development plans for the Lik project. As of June 30, 2020, Solitario has significant balances of cash and short-term investments that Solitario anticipates using, in part, to fund costs and activities intended to further the exploration of the Florida Canyon and Lik projects and to potentially acquire additional mineral property assets. The fluctuations in precious metal and other commodity prices contribute to a challenging environment for mineral exploration and development, which has created opportunities as well as challenges for the potential acquisition of early-stage and advanced mineral exploration projects or other related assets at potentially attractive terms. The accompanying interim condensed consolidated financial statements of Solitario for the three and six months ended June 30, 2020 are unaudited and are prepared in accordance with accounting principles generally accepted in the United States of America (“generally accepted accounting principles”). They do not include all disclosures required by generally accepted accounting principles for annual financial statements, but in the opinion of management, include all adjustments necessary for a fair presentation. Interim results are not necessarily indicative of results which may be achieved in the future, or for the full year ending December 31, 2020. These financial statements should be read in conjunction with the financial statements and notes thereto which are included in Solitario’s Annual Report on Form 10-K for the year ended December 31, 2019. The accounting policies set forth in those annual financial statements are the same as the accounting policies utilized in the preparation of these financial statements, except as modified for appropriate interim financial statement presentation.
Risks and Uncertainties	Solitario faces risks related to health epidemics and other outbreaks of communicable diseases, which could significantly disrupt its operations and may materially and adversely affect our business and financial conditions. Solitario’s business could be adversely impacted by the effects of the coronavirus (“COVID-19”) or other epidemics or pandemics. Solitario has recommended all of its employees and contractors follow government guidelines for health and safety policies for employees and contractors, including encouraging tele-commuting and working from home where possible. Solitario has evaluated the effects of COVID-19 on its operations and taken pro-active steps to address the impacts on its operations, including reducing costs, in response to the economic uncertainty associated with potential risks from COVID-19. These reductions include implementing salary reductions and evaluation and reduction in certain planned 2020 exploration programs through its joint venture partners at the Florida Canyon and Lik exploration projects. Also, Solitairo has evaluated the potential impacts on its ability to access future traditional funding sources on the same or reasonably similar terms as in past periods. Solitario will continue to monitor the effects of COVID-19 on its operations, financial condition and liquidity. However, the extent to which COVID-19 impacts Solitario’s business, including our exploration and other activities and the market for its securities, will depend on future developments, which are highly uncertain and cannot be predicted at this time, and include the duration, severity and scope of the outbreak and the actions taken to contain or treat the coronavirus outbreak.
Cash equivalents	Cash equivalents include investments in highly liquid money-market securities with original maturities of three months or less when purchased. As of June 30, 2020, $359,000 of Solitario’s cash and cash equivalents are held in brokerage accounts and foreign banks, which are not covered under the Federal Deposit Insurance Corporation (“FDIC”) rules for the United States.
Short-term investments	As of June 30, 2020, Solitario has $5,118,000 of its current assets in United States Treasury Securities (“USTS”) with maturities of 30 days to 13 months. In addition, Solitario has $1,564,000 of its current assets in seven bank certificates of deposits (“CD’s”) with face values between $100,000 and $250,000 and maturities between eight and 23 months. The USTS and CD’s are recorded at their fair value based upon quoted market prices. The USTS are not covered under the FDIC insurance rules for United States deposits. Solitario’s USTS and CD’s are highly liquid and may be sold in their entirety at any time at their quoted market price and are classified as a current asset.
Earnings per share	The calculation of basic earnings (loss) per share is based on the weighted average number of shares of common stock outstanding during the three and six months ended June 30, 2020 and 2019. Potentially dilutive shares related to outstanding common stock options for 5,698,000 Solitario common shares were excluded from the calculation of diluted loss per share for the six months ended June 30, 2020 because the effects were anti-dilutive. Potentially dilutive shares related to outstanding common stock options for 4,373,000 Solitario common shares were excluded from the calculation of diluted loss per share for the three and six months ended June 30, 2019 because the effects were anti-dilutive. Potentially dilutive shares related to stock options for 1,475,000 Solitario common shares, with exercise prices of between $0.20 and $0.28 per share, were included in the calculation of diluted earnings per share for the three months ended June 30, 2020 to the extent they were exercisable.
Recent accounting pronouncements	The FASB issued ASU No. 2018-13, Disclosure Framework – Fair Value (topic 820): Changes to Disclosure Requirements for Fair Value Measurement (“ASU No. 2018-13”). Among other things, ASU No. 2018-13 changes the required disclosures regarding (i) transfers between Level 1 and Level 2 fair values; (ii) unrealized gains / losses included in earnings and other comprehensive income for Level 3 instruments; and (iii) amount, reason and policies regarding transfers between Levels. ASU No. 2018-13 is effective for Solitario for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. Solitario adopted ASU No. 2016-13 January 1, 2020 which did not have a material impact on its consolidated financial position or results of operations as of or for the three and six months ended June 30, 2020. Recently issued accounting pronouncements The SEC has adopted amendments to its disclosure rules to modernize the mineral property disclosure requirements for issuers whose securities are registered with the SEC. These amendments became effective February 25, 2019 (the “SEC Modernization Rules”) and, following a two-year transition period, the SEC Modernization Rules will replace the historical property disclosure requirements for mining registrants that are included in SEC Industry Guide 7. Under the SEC Modernization Rules, consistent with global standards as embodied by the Committee for Reserves International Reporting Standards (“CRIRSCO”), registrants will be required to disclose specified information concerning mineral resources that have been identified on one or more of its mineral properties. Consistent with CRIRSCO standards the SEC Modernization Rules have added definitions to recognize “Measured Mineral Resources”, “Indicated Mineral Resources” and “Inferred Mineral Resources.” The Company is not required to provide disclosure on its mineral properties under the SEC Modernization Rules until its fiscal year beginning January 1, 2021. Upon adoption of the SEC Modernization Rules, among other requirements, the Company will be required to report its mineral resources, if any, as Measured, Indicated or Inferred Mineral Resources in accordance with the SEC Modernization Rules. This will allow investors to evaluate the Company’s resources on a comparable basis with other mining and exploration issuers registered with the SEC. In addition, the SEC Modernization Rules will require the Company to disclose exploration results, mineral reserves, if any, and mineral resources based upon information and supporting documentation prepared by a mining expert (the “qualified person”). The SEC Modernization Rules will require the Company to obtain a dated and signed technical report summary from the qualified person identifying and summarizing the information reviewed and conclusions reached by the qualified person(s) about the mineral resources or reserves for each mineral property. The Company is currently evaluating the requirements under the SEC Modernization Rules and has not determined what effect adoption will have on its consolidated financial statements and disclosures.

Business and Significant Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2020

Solitario Zinc Corp. (“Solitario,” or the “Company”) is an exploration stage company as defined in Industry Guide 7, as issued by the United States Securities and Exchange Commission (“SEC”). Solitario was incorporated in the state of Colorado on November 15, 1984 as a wholly-owned subsidiary of Crown Resources Corporation ("Crown"). In July 1994, Solitario became a publicly traded company on the Toronto Stock Exchange (the "TSX") through its initial public offering. Solitario has been actively involved in mineral exploration since 1993. Solitario’s primary business is to acquire exploration mineral properties or royalties and/or discover economic deposits on its mineral properties and advance these deposits, either on its own or through joint ventures, up to the development stage. At that point, or sometime prior to that point, Solitario would likely attempt to sell its mineral properties, pursue their development either on its own or through a joint venture with a partner that has expertise in mining operations, or create a royalty with a third party that continues to advance the property. Solitario is primarily focused on the acquisition and exploration of zinc-related exploration mineral properties; however, Solitario will evaluate and acquire other base and precious metal mineral exploration properties. In addition to focusing on its mineral exploration properties and the evaluation of mineral properties for acquisition, Solitario also evaluates potential strategic transactions for the acquisition of new precious and base metal properties and assets with exploration potential or business combinations that Solitario determines to be favorable to Solitario.

Solitario has recorded revenue in the past from the sale of mineral properties, including (i) the sale of certain mineral royalty properties to SilverStream SEZC, a private Cayman Island royalty and streaming company (“SilverStream”), for Cdn$600,000 in January 2019 (the “Royalty Sale”), and (ii) the sale in June 2018 of its interest in the royalty on its Yanacocha property. In addition, Solitario has received proceeds from (i) the sale in 2015 of its former interest in Mount Hamilton LLC (“MH-LLC”), the owner of its former Mt. Hamilton project; (ii) the sale of a royalty on its former Mt. Hamilton project and (iii) joint venture property payments. Revenues and / or proceeds from the sale or joint venture of properties or assets, although significant when they occur, have not been a consistent annual source of cash and would only occur in the future, if at all, on an infrequent basis.

Solitario currently considers its carried interest in the Florida Canyon project in Peru and its interest in the Lik project in Alaska to be its core mineral property assets. Nexa Resources, Ltd. (“Nexa”), Solitario’s joint venture partner, is expected to continue the exploration and furtherance of the Florida Canyon project and Solitario is monitoring progress at Florida Canyon. Solitario is working with its 50% joint venture partner in the Lik deposit, Teck American Incorporated, a wholly-owned subsidiary of Teck Resources Limited (both companies are referred to as “Teck”), to further the exploration and evaluate potential development plans for the Lik project.

As of June 30, 2020, Solitario has significant balances of cash and short-term investments that Solitario anticipates using, in part, to fund costs and activities intended to further the exploration of the Florida Canyon and Lik projects and to potentially acquire additional mineral property assets. The fluctuations in precious metal and other commodity prices contribute to a challenging environment for mineral exploration and development, which has created opportunities as well as challenges for the potential acquisition of early-stage and advanced mineral exploration projects or other related assets at potentially attractive terms.

The accompanying interim condensed consolidated financial statements of Solitario for the three and six months ended June 30, 2020 are unaudited and are prepared in accordance with accounting principles generally accepted in the United States of America (“generally accepted accounting principles”). They do not include all disclosures required by generally accepted accounting principles for annual financial statements, but in the opinion of management, include all adjustments necessary for a fair presentation. Interim results are not necessarily indicative of results which may be achieved in the future, or for the full year ending December 31, 2020.

These financial statements should be read in conjunction with the financial statements and notes thereto which are included in Solitario’s Annual Report on Form 10-K for the year ended December 31, 2019. The accounting policies set forth in those annual financial statements are the same as the accounting policies utilized in the preparation of these financial statements, except as modified for appropriate interim financial statement presentation.

Risks and Uncertainties

Solitario faces risks related to health epidemics and other outbreaks of communicable diseases, which could significantly disrupt its operations and may materially and adversely affect our business and financial conditions.

Solitario’s business could be adversely impacted by the effects of the coronavirus (“COVID-19”) or other epidemics or pandemics. Solitario has recommended all of its employees and contractors follow government guidelines for health and safety policies for employees and contractors, including encouraging tele-commuting and working from home where possible. Solitario has evaluated the effects of COVID-19 on its operations and taken pro-active steps to address the impacts on its operations, including reducing costs, in response to the economic uncertainty associated with potential risks from COVID-19. These reductions include implementing salary reductions and evaluation and reduction in certain planned 2020 exploration programs through its joint venture partners at the Florida Canyon and Lik exploration projects. Also, Solitairo has evaluated the potential impacts on its ability to access future traditional funding sources on the same or reasonably similar terms as in past periods. Solitario will continue to monitor the effects of COVID-19 on its operations, financial condition and liquidity. However, the extent to which COVID-19 impacts Solitario’s business, including our exploration and other activities and the market for its securities, will depend on future developments, which are highly uncertain and cannot be predicted at this time, and include the duration, severity and scope of the outbreak and the actions taken to contain or treat the coronavirus outbreak.

Cash equivalents

Cash equivalents include investments in highly liquid money-market securities with original maturities of three months or less when purchased. As of June 30, 2020, $359,000 of Solitario’s cash and cash equivalents are held in brokerage accounts and foreign banks, which are not covered under the Federal Deposit Insurance Corporation (“FDIC”) rules for the United States.

Short-term investments

As of June 30, 2020, Solitario has $5,118,000 of its current assets in United States Treasury Securities (“USTS”) with maturities of 30 days to 13 months. In addition, Solitario has $1,564,000 of its current assets in seven bank certificates of deposits (“CD’s”) with face values between $100,000 and $250,000 and maturities between eight and 23 months. The USTS and CD’s are recorded at their fair value based upon quoted market prices. The USTS are not covered under the FDIC insurance rules for United States deposits. Solitario’s USTS and CD’s are highly liquid and may be sold in their entirety at any time at their quoted market price and are classified as a current asset.

Earnings per share

The calculation of basic earnings (loss) per share is based on the weighted average number of shares of common stock outstanding during the three and six months ended June 30, 2020 and 2019.

Potentially dilutive shares related to outstanding common stock options for 5,698,000 Solitario common shares were excluded from the calculation of diluted loss per share for the six months ended June 30, 2020 because the effects were anti-dilutive. Potentially dilutive shares related to outstanding common stock options for 4,373,000 Solitario common shares were excluded from the calculation of diluted loss per share for the three and six months ended June 30, 2019 because the effects were anti-dilutive.

Potentially dilutive shares related to stock options for 1,475,000 Solitario common shares, with exercise prices of between $0.20 and $0.28 per share, were included in the calculation of diluted earnings per share for the three months ended June 30, 2020 to the extent they were exercisable.

Recent accounting pronouncements

The FASB issued ASU No. 2018-13, Disclosure Framework – Fair Value (topic 820): Changes to Disclosure Requirements for Fair Value Measurement (“ASU No. 2018-13”). Among other things, ASU No. 2018-13 changes the required disclosures regarding (i) transfers between Level 1 and Level 2 fair values; (ii) unrealized gains / losses included in earnings and other comprehensive income for Level 3 instruments; and (iii) amount, reason and policies regarding transfers between Levels. ASU No. 2018-13 is effective for Solitario for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. Solitario adopted ASU No. 2016-13 January 1, 2020 which did not have a material impact on its consolidated financial position or results of operations as of or for the three and six months ended June 30, 2020.

Recently issued accounting pronouncements

The SEC has adopted amendments to its disclosure rules to modernize the mineral property disclosure requirements for issuers whose securities are registered with the SEC. These amendments became effective February 25, 2019 (the “SEC Modernization Rules”) and, following a two-year transition period, the SEC Modernization Rules will replace the historical property disclosure requirements for mining registrants that are included in SEC Industry Guide 7. Under the SEC Modernization Rules, consistent with global standards as embodied by the Committee for Reserves International Reporting Standards (“CRIRSCO”), registrants will be required to disclose specified information concerning mineral resources that have been identified on one or more of its mineral properties. Consistent with CRIRSCO standards the SEC Modernization Rules have added definitions to recognize “Measured Mineral Resources”, “Indicated Mineral Resources” and “Inferred Mineral Resources.” The Company is not required to provide disclosure on its mineral properties under the SEC Modernization Rules until its fiscal year beginning January 1, 2021.

Upon adoption of the SEC Modernization Rules, among other requirements, the Company will be required to report its mineral resources, if any, as Measured, Indicated or Inferred Mineral Resources in accordance with the SEC Modernization Rules. This will allow investors to evaluate the Company’s resources on a comparable basis with other mining and exploration issuers registered with the SEC. In addition, the SEC Modernization Rules will require the Company to disclose exploration results, mineral reserves, if any, and mineral resources based upon information and supporting documentation prepared by a mining expert (the “qualified person”). The SEC Modernization Rules will require the Company to obtain a dated and signed technical report summary from the qualified person identifying and summarizing the information reviewed and conclusions reached by the qualified person(s) about the mineral resources or reserves for each mineral property. The Company is currently evaluating the requirements under the SEC Modernization Rules and has not determined what effect adoption will have on its consolidated financial statements and disclosures.