Exhibit 31  Certification  I, David A. Chaput, certify that:  1.I have reviewed this annual report on
Form 10-K of The Doe Run Resources Corporation;  2.Based on my knowledge, this report does
not contain any untrue statement of a material fact or omit to state a material
fact necessary to make the statements made, in light of the circumstances under
which such statements were made, not misleading with respect to the period
covered by this report;  3.Based on my knowledge, the financial
statements, and other financial information included in this annual report,
fairly present in all material respects the financial condition, results of
operations and cash flows of the registrant as of October 31, 2003 and
2002, and for the periods presented in this report;  4.The registrants other certifying
officer and I are responsible for establishing and maintaining disclosure
controls and procedures (as defined in Exchange Act Rules 13a and 15d-e) for
the registrant and have:  a) Designed such disclosure controls and
procedures, or caused such disclosure controls and procedures to be designed
under our supervision to ensure that material information relating to the
registrant, including its consolidated subsidiaries, is made known to us by
others within those entities, particularly during the period in which this
report is being prepared;  b) Evaluated the effectiveness of the
registrants disclosure controls and procedures and presented in this report
our conclusion about the effectiveness of the disclosure control and procedures
as of the end of the period covered by this report based on such evaluation;
and  c) Disclosed in this report any change in the
registrants internal control over financial reporting that occurred during the
registrants fourth fiscal quarter that has materially affected, or is
reasonably likely to materially affect, the registrants internal control over
financial reporting; and  5.The registrants other certifying
officer and I have disclosed, based on our most recent evaluation of internal
control over financial reporting, to the registrants auditors and the audit
committee of registrants board of directors (or persons performing the
equivalent functions):  a) All significant deficiencies and material
weaknesses in the design or operation of internal control over financial
reporting which are reasonably likely to adversely affect the registrants
ability to record, process, summarize and report financial information; and  b) Any fraud, whether or not material, that
involves management or other employees who have a significant role in the
registrants internal control over financial reporting   Date:
  June 2, 2004/s/ David A. ChaputDavid A. ChaputChief Financial Officer  
   Certification  I, Jeffrey L. Zelms, certify that:  1.I have reviewed this annual report on
Form 10-K of The Doe Run Resources Corporation;  2.Based on my knowledge, this report does
not contain any untrue statement of a material fact or omit to state a material
fact necessary to make the statements made, in light of the circumstances under
which such statements were made, not misleading with respect to the period
covered by this report;  3.Based on my knowledge, the financial
statements, and other financial information included in this annual report, fairly
present in all material respects the financial condition, results of operations
and cash flows of the registrant as of October 31, 2003 and 2002, and for
the periods presented in this report;  4.The registrants other certifying
officer and I are responsible for establishing and maintaining disclosure
controls and procedures (as defined in Exchange Act Rules 13a and 15d-e) for
the registrant and have:  a) Designed such disclosure controls and
procedures, or caused such disclosure controls and procedures to be designed
under our supervision to ensure that material information relating to the
registrant, including its consolidated subsidiaries, is made known to us by
others within those entities, particularly during the period in which this
report is being prepared;  b) Evaluated the effectiveness of the
registrants disclosure controls and procedures and presented in this report
our conclusion about the effectiveness of the disclosure control and procedures
as of the end of the period covered by this report based on such evaluation;
and  c) Disclosed in this report any change in the
registrants internal control over financial reporting that occurred during the
registrants fourth fiscal quarter that has materially affected, or is
reasonably likely to materially affect, the registrants internal control over
financial reporting; and  5.The registrants other certifying
officer and I have disclosed, based on our most recent evaluation of internal
control over financial reporting, to the registrants auditors and the audit
committee of registrants board of directors (or persons performing the
equivalent functions):  a) All significant deficiencies and material
weaknesses in the design or operation of internal control over financial
reporting which are reasonably likely to adversely affect the registrants
ability to record, process, summarize and report financial information; and  b) Any fraud, whether or not material, that
involves management or other employees who have a significant role in the
registrants internal control over financial reporting   Date:
  June 2, 2004/s/ Jeffrey L. ZelmsJeffrey L. ZelmsVice Chairman, President and
  Chief Executive Officer