XML 34 R23.htm IDEA: XBRL DOCUMENT v3.22.2.2

Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2022

Summary of Significant Accounting Policies

Schedule of Cost Method Investments

June 30, 2022

December 31, 2021

Joint Venture

% Ownership

Significant Influence?

Accounting Method

% Ownership

Significant Influence?

Accounting Method

NJMJV

65

%

Yes

Consolidated

65

%

Yes

Consolidated

Butte Highlands Joint Venture (“BHJV”)

50

%

No

Cost

50

%

No

Cost

Buckskin Gold and Silver

37

%

Yes

Equity

37

%

Yes

Equity

X

- References

No definition available.

+ Details

Name:	nisri_SummaryOfSignificantAccountingPoliciesAbstract
Namespace Prefix:	nisri_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

A tabular disclosure of (a) the aggregate carrying amount of all cost-method investments; (b) the aggregate carrying amount of cost-method investments that the investor did not evaluate for impairment for cost-method investments.

+ References

No definition available.

+ Details

Name:	us-gaap_ScheduleOfCostMethodInvestmentsTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration