2026-03-31T23:22:51-04:00 2025-10-31 205804965 DESMET CPA GROUP LLC PO BOX 748 WINNER SD 57580 990 2024-11-01 460337824 MAMMOTH SITE OF HOT SPRINGS MAMM 6057456017 1800 US-18 BYPASS HOT SPRINGS SD 57747 ROBERT PREUSS TREASURER 6057456017 2026-03-31 true true ANNA DESMET P01246974 6058421757 2026-03-31 X 2024 2025-03-06 01:10:19Z JOHN PENCE PO BOX 692 HOT SPRINGS SD 57747 1855678 false X WWW.MAMMOTHSITE.COM X 1975 SD THE MISSION OF THE ORGANIZATION IS THE PRESERVATION, RESEARCH, AND INTERPRETATION OF THE MAMMOTH SITE OF HOT SPRINGS, SOUTH DAKOTA, AND DEVELOPMENT OF A BROAD UNDERSTANDING OF THE LATE ICE AGE RECORD ACROSS A GLOBAL FRAMEWORK. 12 12 54 100 0 283938 175869 1095059 1089217 63597 67851 377645 285567 1820239 1618504 0 0 987602 949899 0 99315 787568 734259 1775170 1684158 45069 -65654 6358764 6458752 73810 60437 6284954 6398315 X THE MISSION OF THE ORGANIZATION IS THE PRESERVATION, RESEARCH, AND INTERPRETATION OF THE MAMMOTH SITE OF HOT SPRINGS, SOUTH DAKOTA, AND DEVELOPMENT OF A BROAD UNDERSTANDING OF THE LATE ICE AGE RECORD ACROSS A GLOBAL FRAMEWORK. false false 1323851 1089217 RECOVER, PRESERVE AND EXHIBIT FINDINGS FROM THE MAMMOTH SITE. PROVIDE EDUCATIONAL PROGRAMS AND GUIDED TOURS OF THE SITE AND BONEBED. 1323851 true true false false false false false true false true true false false false false false true false false false false false false false false false false false false false false false false false false false false false false false false false false false false false false true 4 0 54 true false false false false false false false false X 12 12 false false false false false false false true true false false true true true true true true true true false X PRESSTON GABEL 6057456017 PO BOX 392 HOT SPRINGS SD 57747 X CALEB ARCENEAUX SECRETARY 1.00 X X 0 0 0 TIA BERENS MEMBER 1.00 X 0 0 0 RICK DENHERDER MEMBER 1.00 X 0 0 0 JANE FARRELL LEGAL ADVISO 1.00 X 0 0 0 GREG GUNWALL MEMBER 1.00 X 0 0 0 TERRY HINN VICE PRESIDE 1.00 X X 0 0 0 DR MIKE LEITE MEMBER 1.00 X 0 0 0 ANNA MERRILL MEMBER 1.00 X 0 0 0 JOHN PENCE PRESIDENT 1.00 X X 0 0 0 ROBERT PREUSS TREASURER 1.00 X X 0 0 0 RANDY SCHUR MEMBER 1.00 X 0 0 0 AMY SPEARS MEMBER 1.00 X 0 0 0 false false false 175869 175869 ADMISSIONS & TOURS 541700 1009981 1009981 EDUCATIONAL PROGRAMS 541700 36239 36239 OTHER INCOME 541700 30153 30153 MEMBERSHIPS 541700 12844 12844 1089217 64033 64033 3818 3818 3818 3818 522741 237174 285567 285567 1618504 1378602 64033 840744 663795 125462 51487 46042 34813 9053 2176 63113 50490 9467 3156 65688 47325 8873 9490 28190 28190 11094 9985 1109 144858 121539 19924 3395 14794 13315 1479 204924 163939 30739 10246 97380 77904 14607 4869 PROGRAM SUPPLIES 96593 82627 13966 CREDIT CARD FEES 36603 36603 OTHER OPERATING EXPENSES 34135 21516 12089 530 1684158 1323851 260992 99315 514977 357341 711697 951907 5143 5223 176782 132864 6666633 3961211 2887570 2705422 1782819 1995726 279776 310269 6358764 6458752 73810 60437 73810 60437 X 6249965 6363326 34989 34989 6284954 6398315 6358764 6458752 X -65654 148522 30493 X true X false false X 3123078 314334 337593 283938 175869 4234812 1938321 1821233 1689136 1718800 1611958 8779448 5061399 2135567 2026729 2002738 1787827 13014260 2404181 128563 124608 114337 48981 2820670 2404181 128563 124608 114337 48981 2820670 10193590 107929 8137 42898 63597 64033 286594 107929 8137 42898 63597 64033 286594 5169328 2143704 2069627 2066335 1851860 13300854 0.76640 0.76130 0.02000 0.02000 X RESTRICTED RESTRICTED RESTRICTED RESTRICTED RESTRICTED RESTRICTED RESTRICTED RESTRICTED false false false 268671 268671 4563785 2594967 1968818 1834177 1366244 467933 2705422 1618504 1618504 1618504 1684158 1684158 1684158 SCHEDULE D, PAGE 2, PART V, LINE 4 THE PURPOSE OF THE ENDOWMENT FUNDS IS TO FUND FUTURE OPERATIONS OF THE MAMMOTH SITE TO ENSURE ITS CONTINUED EXISTENCE AND RESEARCH. FORM 990 - ORGANIZATION'S MISSION THE MISSION OF THE ORGANIZATION IS THE PRESERVATION, RESEARCH, AND INTERPRETATION OF THE MAMMOTH SITE OF HOT SPRINGS, SOUTH DAKOTA, AND DEVELOPMENT OF A BROAD UNDERSTANDING OF THE LATE ICE AGE RECORD ACROSS A GLOBAL FRAMEWORK. FORM 990, PAGE 6, PART VI, LINE 11B THE FORM 990 IS MADE AVAIABLE TO ALL BOARD MEMBERS FOR REVIEW VIA EMAIL AND DURING THE QUARTERLY MEETING AND IS REVIEWED, AT MINIMUM, BY THE SIGNING BOARD MEMBER PRIOR TO FILING. FORM 990, PAGE 6, PART VI, LINE 12C ALL, IF ANY, CONFLICTS OF INTEREST ARE BROUGHT TO THE BOARD OF DIRECTORS TO RESOLVE. IF A CONFLICT INVOLVES A BOARD MEMBER, THEN THEY CANNOT PARTICIPATE IN, OR VOTE ON, THE MATTER. FORM 990, PAGE 6, PART VI, LINE 15A TOP MANAGEMENT COMPENSATION IS SET BY THE BOARD OF DIRECTORS. FORM 990, PAGE 6, PART VI, LINE 15B THE BOARD IS A VOLUNTEER BOARD AND THE MEMBERS AND OFFICERS ARE NOT COMPENSATED. KEY EMPLOYEE COMPENSATION LEVELS ARE DETERMINED AND SET BY THE BOARD OF DIRECTORS. FORM 990, PAGE 6, PART VI, LINE 19 ALL GOVERNING DOCUMENTS, POLICIES AND FINANCIAL STATEMENTS ARE MAINTAINED AT THE MAMMOTH SITE'S OFFICE AND ARE MADE AVAILABLE TO THE PUBLIC UPON REQUEST. FORM 990, PART XI, LINE 9 NET CHANGE IN BENEFICIAL INTEREST 30,493