Six Months Ended
June 30,

(in thousands)

2019

2018

Cash paid during the period for:

Interest

$

4,536

$

909

Non-cash transactions:

Capital expenditures included in accounts payable and accrued liabilities

$

39

$

(161

)

Adjustments to OIE Membership Acquisition purchase price

$

1,317

$

-

Increase in asset retirement obligations

$

-

$

3,560

Non-cash acquisition of Carbon California interests

$

-

$

(18,906

)

Carbon California Acquisition on February 1, 2018

$

-

$

17,114

Obligations assumed with Seneca asset purchase

$

-

$

330

Accrued dividend for convertible preferred stock

$

-

$

71

Beneficial conversion feature for convertible preferred stock

$

-

$

1,125

Exercise of warrant derivative

$

-

$

(1,792

)