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Fair Value Measurement (Tables)
12 Months Ended
Dec. 31, 2022
Fair Value Measurement  
Assets measured at fair value by level within fair value hierarchy

As of

As of

December 31, 

December 31,

Input Hierarchy Level

2022

2021

(in thousands)

Cash and cash equivalents

$

23,675

$

33,712

Level 1

Accounts receivable, net

$

5,085

$

8,672

Level 2

Investment in equity securities-Maritime

$

1,559

$

-

Level 1

Investment in equity securities-Green Light Metals

$

3,611

$

-

Level 3

Derivative liability - zinc zero cost collar

$

-

$

(1,844)

Level 2

Gains and Losses Related to Changes in Fair Value

For the year ended December 31, 

Statements of Operations Classification

2022

2021

Note

Realized and unrealized derivative (loss) gain, net

14

$

(363)

$

1,002

Sales, net

Realized loss on zinc zero cost collar

17

$

(2,014)

$

(1,156)

Realized and unrealized loss on zinc zero cost collar

Unrealized gain (loss) on zinc zero cost collar

17

$

1,844

$

(1,844)

Realized and unrealized loss on zinc zero cost collar

Realized and Unrealized Gain Losses on Derivatives

The following tables summarize the Company’s realized/unrealized derivatives, net (in thousands):

Gold

Silver

Copper

Lead

Zinc

Total

For the year ended December 31, 2022

Realized loss

$

(79)

$

-

$

(127)

$

(150)

$

(364)

$

(720)

Unrealized gain (loss)

136

433

7

153

(372)

357

Total realized/unrealized derivatives, net

$

57

$

433

$

(120)

$

3

$

(736)

$

(363)

Gold

Silver

Copper

Lead

Zinc

Total

For the year ended December 31, 2021

Realized (loss) gain

$

(47)

$

(44)

$

73

$

163

$

632

$

777

Unrealized (loss) gain

-

(159)

6

(2)

380

225

Total realized/unrealized derivatives, net

$

(47)

$

(203)

$

79

$

161

$

1,012

$

1,002