8% Unsecured Convertible Promissory Note of the Company, dated February 8, 2024

Exhibit 4.2

THE SECURITIES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE UNITED STATES SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES ACT”). THESE SECURITIES MAY BE OFFERED, SOLD, PLEDGED OR OTHERWISE TRANSFERRED ONLY (A) TO THE COMPANY, (B) OUTSIDE THE UNITED STATES IN COMPLIANCE WITH RULE 904 OF REGULATION S UNDER THE SECURITIES ACT, (C) IN COMPLIANCE WITH RULE 144 OR 144A THEREUNDER, IF AVAILABLE, AND IN ACCORDANCE WITH APPLICABLE STATE SECURITIES LAWS, (D) PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT, OR (E) IN A TRANSACTION THAT DOES NOT REQUIRE REGISTRATION UNDER THE SECURITIES ACT OR ANY APPLICABLE STATE SECURITIES LAWS, AND THE HOLDER HAS, PRIOR TO SUCH SALE, FURNISHED TO THE COMPANY AN OPINION OF COUNSEL OR OTHER EVIDENCE OF EXEMPTION, IN EITHER CASE REASONABLY SATISFACTORY TO THE COMPANY. HEDGING TRANSACTIONS INVOLVING THESE SECURITIES MAY NOT BE CONDUCTED UNLESS IN COMPLIANCE WITH THE SECURITIES ACT.

8% UNSECURED CONVERTIBLE PROMISSORY NOTE

PUREBASE CORPORATION

ISSUANCE DATE: February 8, 2024

MATURITY DATE: February 7, 2026

Article I

This Unsecured Convertible Promissory Note (the “Note”) is a duly authorized and issued convertible promissory note (the “Note”) of PUREBASE CORPORATION, a Nevada corporation (the “Company”). The Note has been issued in accordance with exemptions from registration under the Securities Act of 1933, as amended (the “Securities Act”).

Section 1.01 Principal. FOR VALUE RECEIVED, the Company hereby promises to pay to the order of U.S. Mine Corp., a Nevada corporation (together with its permitted assigns, the “Holder”), in lawful money of the United States of America and in immediately available funds, the principal sum when fully funded of Six Hundred Eighteen Thousand and 00/100 Dollars ($618,000.00) (the “Principal Sum”). The Principal Sum will be funded by Holder in equal Installments as follows:

Upon the Issuance Date - $103,000

On or about March 1, 2024 - $103,000

On or about April 1, 2024 - $103,000

On or about May 1, 2024 - $103,000

On or about June 1, 2024 - $103,000

On or about July 1, 2024 - $103,000

The entire Principal Sum will be due and payable on or before February 7, 2026 (the “Maturity Date”), together with all interest accrued thereon in accordance with the terms of this Note.

Section 1.02 Interest. Interest shall be payable on the unpaid principal amount of this Note at a rate equal to eight percent (8%) per annum (the “Interest Rate”), commencing to accrue on the date each Installment is funded and payable on the Maturity Date or earlier prepayment date as provided for herein. Interest will be computed on the basis of a 360-day year of twelve 30-day months for the actual number of days elapsed. In addition, the Company shall pay interest on any amount of principal not paid when due from the date on which payment was due to the date of payment, on demand, at a rate equal to five percent (5%) per annum above the Interest Rate (the “Default Interest Rate”).

Section 1.03 Payments. All payments made hereunder shall be credited, regardless of their designation by the Company, first to outstanding late charges, then to accrued and unpaid interest, and the remainder, if any, to principal. In no event shall the amount of interest payable under this Note exceed the maximum rate permitted by law and, notwithstanding any other provision of this Note, any interest payment that would, for any reason, be deemed unlawful shall be applied to the payment of principal. If any payment of principal or interest becomes due on a day other than a Business Day, such payment shall be made not later than the next succeeding Business Day, and such extension shall be included in computing interest in connection with such payment. All payments by the Company hereunder shall be made in lawful money of the United States of America, in immediately available funds. For purposes of this Note, the term “Business Day” means a day (other than a Saturday or Sunday) on which commercial banks are permitted or required to be open for the conduct of commercial banking business in New York, New York.

Section 1.04 Prepayment. At its option, the Company may prepay the principal amount of this Note, in whole or in part, at any time without penalty or premium provided that on the date of prepayment the Company also pays all interest then accrued and unpaid on the principal amount of this Note.

Section 1.05 Use of Loan Proceeds. Company shall use the proceeds of this Note for the payment of legal fees incurred by Company in the Calvanico arbitration.

Section 1.06 Conversion. On the Maturity Date, the Holder may, in its sole discretion, determine to convert ( “Conversion”) all or part of the outstanding principal amount of this Note, together with accrued and unpaid interest due thereon, into shares of common stock (“Common Stock”) of the Company, par value $0.001 per share (the “Conversion Shares”) at a conversion price of $0.08 per share (the “Conversion Price”). The Company shall not issue any fraction of a Conversion Share upon any such conversion. If the issuance would result in the issuance of a fraction of a Conversion Share, the Company shall round such fraction of a Conversion Share up to the nearest whole Conversion Share. The number of Conversion Shares issuable upon a Conversion shall be determined by the quotient obtained by dividing (i) the outstanding principal amount of this Note being converted plus accrued but unpaid interest thereon on the conversion date for the Conversion by (ii) the Conversion Price. The calculation by the Company of the number of Conversion Shares to be received by the Holder upon conversion hereof, shall be conclusive absent manifest error. To convert any portion of the unpaid principal of this Note into Conversion Shares on or after the Maturity Date (an “Conversion Date”), the Holder shall (i) transmit by facsimile (or otherwise deliver), for receipt on or prior to 12:00 noon., New York time, on such date, a copy of an executed notice of conversion in the form attached hereto as Exhibit A (the “ Conversion Notice”) to the Company and (ii) return this Note to the Company via a nationally recognized overnight delivery service (or provide an indemnification undertaking with respect to this Note in the case of its loss, theft or destruction). On or before the fifth trading day for the Company’s Common Stock following the date of receipt of a Conversion Notice, the Company shall cause the Company’s transfer agent to issue and deliver to the Holder at the address as specified in the Conversion Notice, a certificate, registered in the name of the Holder, for the number of Conversion Shares to which the Holder shall be entitled. If the outstanding principal amount of this Note is greater than the principal portion being converted, then the Company shall as soon as practicable after receipt of this Note, at its own expense, issue and deliver to the Holder a new Note representing the outstanding principal amount not converted. Such new Note (i) shall be of like tenor with this Note, (ii) shall represent, as indicated on the face of such new Note, the principal amount remaining outstanding, (iii) shall have an issuance date, as indicated on the face of such new Note, which is the same as the date of this Note, and (iv) shall have the same rights and conditions as this Note.

Section 1.07 Absolute Obligation. Except as expressly provided herein, no provision of this Note shall alter or impair the obligation of the Company, which is absolute and unconditional, to pay the principal of, and liquidated damages (if any) on, this Note at the time, place, and rate, and in the coin or currency, herein prescribed. This Note is a direct debt obligation of the Company.

Section 1.08 Reliance on Note Register. Prior to due presentment to the Company for permitted transfer or conversion of this Note, the Company and any agent of the Company may treat the name in which this Note is duly registered as the owner hereof for the purpose of receiving payment as herein provided and for all other purposes, whether or not this Note is overdue, and neither the Company nor any such agent shall be affected by notice to the contrary.

Section 1.09 Paying Agent and Registrar. Initially, the Company will act as paying agent and registrar. The Company may change any paying agent, registrar, or Company-registrar by giving the Holder not less than five (5) business days’ written notice of its election to do so, specifying the name, address, telephone number and email address of the paying agent or registrar. The Company may act in any such capacity.

Section 1.10 Investment Representations. This Note may be transferred or exchanged only in compliance with applicable federal and state securities laws and regulations.

Section 1.11 Security; Other Rights. The obligations of the Company to the Holder under this Note are unsecured. However, in addition to the rights and remedies given to it by this Note, the Holder shall have all those rights and remedies allowed by applicable law.

Section 1.12 Reservation of Common Stock. The Company shall reserve and keep available out of its authorized but unissued shares of Common Stock, solely for the purpose of conversion of this Note, that number of shares of Common Stock equal to the number of Conversion Shares into which the Note is convertible based upon the Conversion Price.

Article II

Section 2.01 Events of Default. Each of the following events shall constitute a default under this Note (each an “Event of Default”):

Section 2.02 If any Event of Default specified in Section 2.01(b) or Section 2.01(c) occurs, then the full principal amount of this Note, together with any other amounts owing in respect thereof, to the date of the Event of Default, shall become immediately due and payable without any action on the part of the Holder, and if any other Event of Default occurs, the full principal amount of this Note, together with any other amounts owing in respect thereof, to the date of acceleration shall become, at the Holder’s election, immediately due and payable in cash.

Article III

Section 3.01 Covenants. So long as this Note shall remain in effect and until any outstanding principal and interest and all fees and all other expenses or amounts payable under this Note have been paid in full, unless the Holder shall otherwise consent in writing (such consent not to be unreasonably withheld), the Company shall:

Article IV

Section 4.01 Representations of the Company. The Company hereby represents and warrants to the Holder that:

Article V

5.01 Registration Rights. Neither the Note, nor the Conversion Shares that may be acquired upon conversion of the Note, have been registered under the Securities Act, or any state securities laws, and the Company has no obligation to register the Note and Conversion Shares.

Article VI

Section 6.01 Conversion Price Adjustments.

(a) General. The conversion price and the number of Conversion Shares issuable upon the conversion of this Note shall be subject to adjustment from time to time upon the occurrence of certain events described in this Section 6.01.

(A) any shares of stock or other securities that are at any time directly or indirectly convertible into or exchangeable for Common Stock, or any rights or options to subscribe for, purchase or otherwise acquire any of the foregoing by way of dividend or other distribution, or

(B) additional stock or other securities or property (including cash) by way of spin-off, split-up, reclassification, combination of shares or similar corporate rearrangement (other than shares of Common Stock issued as a stock split or adjustments in respect of which shall be covered by the terms of Section 6.01(a)(i) above),

then and in each such case, the conversion price and the number of Conversion Shares to be issued upon conversion of this Note shall be adjusted proportionately, and the Holder hereof shall, upon the conversion of this Note, be entitled to receive, in addition to the number of Conversion Shares receivable thereupon, and without payment of any additional consideration therefor, the amount of stock and other securities and property (including cash in the cases referred to above) that such Holder would hold on the date of such exercise had such Holder been the holder of record of such Common Stock as of the date on which holders of Common Stock received or became entitled to receive such shares or all other additional stock and other securities and property. The conversion price and the Conversion Shares, as so adjusted, shall be readjusted in the same manner upon the happening of any successive event or events described in this Section 6.01(a)(ii).

Article VII

Section 7.01 Notice. Notices regarding this Note shall be sent to the parties at the following addresses, unless a party notifies the other parties, in writing, of a change of address:

Section 7.02 Governing Law; Jurisdiction. All questions concerning the construction, validity, enforcement and interpretation of this Note shall be governed by and construed and enforced in accordance with the internal laws of the State of California, without regard to the principles of conflicts of law thereof. Each party agrees that all legal proceedings concerning the interpretations, enforcement and defense of the transactions contemplated by this Note (whether brought against a party hereto or its respective affiliates, directors, officers, shareholders, employees or agents) shall be commenced in the state and federal courts sitting in Sacramento County, California (the “California Courts”). Each party hereto hereby irrevocably submits to the exclusive jurisdiction of the California Courts for the adjudication of any dispute hereunder or in connection herewith or with any transaction contemplated hereby or discussed herein (including with respect to the enforcement of this Note), and hereby irrevocably waives, and agrees not to assert in any suit, action or proceeding, any claim that it is not personally subject to the jurisdiction of any such court, or such California Courts are improper or inconvenient venue for such proceeding. Each party hereby irrevocably waives personal service of process and consents to process being served in any such suit, action or proceeding by mailing a copy thereof via registered or certified mail or overnight delivery (with evidence of delivery) to such party at the address in effect for notices to it under this Note and agrees that such service shall constitute good and sufficient service of process and notice thereof. Nothing contained herein shall be deemed to limit in any way any right to serve process in any manner permitted by law. Each party hereto hereby irrevocably waives, to the fullest extent permitted by applicable law, any and all right to trial by jury in any legal proceeding arising out of or relating to this Note or the transactions contemplated hereby. If either party shall commence an action or proceeding to enforce any provisions of this Note, then the prevailing party in such action or proceeding shall be reimbursed by the other party for its attorney’s fees and other costs and expenses incurred with the investigation, preparation and prosecution of such action or proceeding.

Section 7.03 Severability. The invalidity of any of the provisions of this Note shall not invalidate or otherwise affect any of the other provisions of this Note, which shall remain in full force and effect.

Section 7.04 Entire Agreement and Amendments. This Note represents the entire agreement between the parties hereto with respect to the subject matter hereof and there are no representations, warranties or commitments, except as set forth herein. This Note may be amended only by an instrument in writing executed by the Company and the Holder.

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IN WITNESS WHEREOF, with the intent to be legally bound hereby, the Company as executed this Note as of the date first written above.

EXHIBIT A

NOTICE OF CONVERSION

(To be executed by the Holder in order to convert the Note)

The undersigned hereby irrevocably elects to convert the unpaid principal amount and accrued interest amount indicated below of the 8% Unsecured Convertible Promissory Note due February 7, 2026 (the “Note”) into Conversion Shares of Purebase Corporation, according to the conditions stated therein, as of the Conversion Date written below.