UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

x

Rule 13d-1(b)

o

Rule 13d-1(c)

o

Rule 13d-1(d)

1

Name of Reporting Person
Senrigan Capital Group Limited

2

Check the Appropriate Box if a Member of a Group

(a)

x

(b)

o

3

SEC Use Only

4

Citizenship or Place of Organization
Hong Kong

Number of
Shares
Beneficially
Owned by
Each
Reporting
Person With

5

Sole Voting Power
- 0 -

6

Shared Voting Power
8,045,012

7

Sole Dispositive Power
- 0 -

8

Shared Dispositive Power
8,045,012

9

Aggregate Amount Beneficially Owned by Each Reporting Person
8,045,012

10

Check Box if the Aggregate Amount in Row (9) Excludes Certain Shares  o

11

Percent of Class Represented by Amount in Row (9)
9.5%

12

Type of Reporting Person
CO

1

Name of Reporting Person
Senrigan Capital Management Limited

2

Check the Appropriate Box if a Member of a Group

(a)

x

(b)

o

3

SEC Use Only

4

Citizenship or Place of Organization
Cayman Islands

Number of
Shares
Beneficially
Owned by
Each
Reporting
Person With

5

Sole Voting Power
- 0 -

6

Shared Voting Power
8,045,012

7

Sole Dispositive Power
- 0 -

8

Shared Dispositive Power
8,045,012

9

Aggregate Amount Beneficially Owned by Each Reporting Person
8,045,012

10

Check Box if the Aggregate Amount in Row (9) Excludes Certain Shares  o

11

Percent of Class Represented by Amount in Row (9)
9.5%

12

Type of Reporting Person
CO

1

Name of Reporting Person
Nick Taylor

2

Check the Appropriate Box if a Member of a Group

(a)

x

(b)

o

3

SEC Use Only

4

Citizenship or Place of Organization
United Kingdom

Number of
Shares
Beneficially
Owned by
Each
Reporting
Person With

5

Sole Voting Power
- 0 -

6

Shared Voting Power
8,045,012

7

Sole Dispositive Power
- 0 -

8

Shared Dispositive Power
8,045,012

9

Aggregate Amount Beneficially Owned by Each Reporting Person
8,045,012

10

Check Box if the Aggregate Amount in Row (9) Excludes Certain Shares  o

11

Percent of Class Represented by Amount in Row (9)
9.5%

12

Type of Reporting Person
IN

Item 1(a).

Name of Issuer:

Jaguar Mining Inc.

Item 1(b).

Address of Issuer’s Principal Executive Offices:

125 North State Street
Concord, New Hampshire
USA 03301

Item 2(a).

Name of Person Filing:

This statement is filed by Senrigan Capital Group Limited, a Hong Kong private company (“Senrigan Capital”), Senrigan Capital Management Limited (“SCM”) and Nick Taylor, each with respect to the Issuer’s common stock (“Shares”).  Each of the foregoing is referred to as a “Reporting Person” and collectively as the “Reporting Persons.”

Item 2(b).

Address of Principal Business Office or, if none, Residence:

The principal business address of each of Senrigan Capital and Mr. Taylor is 15th Floor, Wheelock House, 20 Pedder Street, Central, Hong Kong.

The principal business address of SCM is PO Box 309, Ugland House, Grand Cayman, KY-1104, Cayman Islands.

Item 2(c).

Citizenship:

Senrigan Capital is organized under the laws of Hong Kong.  SCM is organized under the laws of the Cayman Islands.  Mr. Taylor is a citizen of the United Kingdom.

Item 2(d).

Title of Class of Securities:

Common Stock, no par value per share.

Item 2(e).

CUSIP Number:

47009M103

Item 3.

If this statement is filed pursuant to Section 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:

o

Not Applicable

(a)

o

Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o).

(b)

o

Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c).

(c)

o

Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c).

(d)

o

Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8).

(e)

o

Investment adviser in accordance with Section 240.13d-1(b)(1)(ii)(E).

(f)

o

Employee benefit plan or endowment fund in accordance with Section 240.13d-1(b)(1)(ii)(F).

(g)

o

Parent holding company or control person in accordance with Section 240.13d-1(b)(1)(ii)(G).

(h)

o

Savings association as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813).

(i)

o

Church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act (15 U.S.C. 80a-3).

(j)

o

Non-U.S. institution in accordance with Section 240.13d–1(b)(1)(ii)(J).

(k)

x

Group, in accordance with Section 240.13d–1(b)(1)(ii)(J).

Item 4.

Ownership.

All ownership information reported in this Item 4 is as of the close of business on December 31, 2011.

Senrigan Capital

(a)

Amount beneficially owned:   

8,045,012 Shares

(b)

Percent of class:   

9.5%

(c)

Number of shares as to which such person has:

(i)

Sole power to vote or to direct the vote     

0 Shares

(ii)

Shared power to vote or to direct the vote      

8,045,012 Shares

(iii)

Sole power to dispose or to direct the disposition of     

0 Shares

(iv)

Shared power to dispose or to direct the disposition of     

8,045,012 Shares

SCM

(a)

Amount beneficially owned:   

8,045,012 Shares

(b)

Percent of class:   

9.5%

(c)

Number of shares as to which such person has:

(i)

Sole power to vote or to direct the vote     

0 Shares

(ii)

Shared power to vote or to direct the vote      

8,045,012 Shares

(iii)

Sole power to dispose or to direct the disposition of     

0 Shares

(iv)

Shared power to dispose or to direct the disposition of     

8,045,012 Shares

Mr. Taylor

(a)

Amount beneficially owned:   

8,045,012 Shares

(b)

Percent of class:   

9.5%

(c)

Number of shares as to which such person has:

(i)

Sole power to vote or to direct the vote     

0 Shares

(ii)

Shared power to vote or to direct the vote      

8,045,012 Shares

(iii)

Sole power to dispose or to direct the disposition of     

0 Shares

(iv)

Shared power to dispose or to direct the disposition of     

8,045,012 Shares

Item 5.

Ownership of Five Percent or Less of a Class.

If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following   o.

Item 6.

Ownership of More than Five Percent on Behalf of Another Person.

Not Applicable.

Item 7.

Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on By the Parent Holding Company or Control Person.

Not Applicable.

Item 8.

Identification and Classification of Members of the Group.

See Exhibit 99.1.

Item 9.

Notice of Dissolution of Group.

Not Applicable.

Item 10.

Certifications.

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect.

By signing below I certify that, to the best of my knowledge and belief, the foreign regulatory scheme applicable to Hong Kong registered Type 9 (asset management) license holders is substantially comparable to the regulatory scheme applicable to the functionally equivalent U.S. institution(s). I also undertake to furnish to the Commission staff, upon request, information that would otherwise be disclosed in a Schedule 13D.

Dated: January 17, 2012

Senrigan Capital Group Limited

By:

/s/ Chris Nash

Name:

Chris Nash

Title:

Chief Operating Officer

Senrigan Capital Management Limited

/s/ Nick Taylor

Nick Taylor

Director

/s/ Nick Taylor

Nick Taylor