---
type: "Bill"
title: "Revise coal bonding laws"
description: "Revise coal bonding laws"
jurisdiction: "us/states/mt"
legislature: "Montana Legislature"
session: "2021"
identifier: "SB 328"
citation: "Montana SB 328 (2021)"
classification: ["bill"]
subjects: ["Environmental Protection", "Mining and Minerals (see also: Oil and Gas)"]
status: "enacted"
primary_sponsors: ["Duane Ankney"]
version_count: 4
action_count: 54
vote_count: 8
first_action: "2020-12-10"
last_action: "2021-04-30"
source: "openstates"
source_identifier: "ocd-bill/435314f3-7686-4c96-a73e-d3885b6d43e4"
source_url: "http://laws.leg.mt.gov/legprd/LAW0210W$BSIV.ActionQuery?P_BILL_NO1=328&P_BLTP_BILL_TYP_CD=SB&Z_ACTION=Find&P_SESS=20211"
source_hash: "ca267cf6558f2e2251ca99b5f3ba95afa4a95774e9dcd8255276665b9c353825"
vintage: "2026-07-01"
source_snapshot: "https://data.openstates.org/daily/2026-07-01/public.pgdump"
retrieved_at: "2026-07-06"
confidence: "reported"
tags: ["legislation", "bill", "us-mt"]
---

# Montana SB 328 (2021) — Revise coal bonding laws

## Version chain

The bill's text revisions, in order — the diff chain from filing to enrollment.

1. **SB0328_1.pdf** (committee substitute) — [source](https://leg.mt.gov/bills/2021/SB0399//SB0328_1.pdf)
2. **SB0328_2.pdf** (committee substitute) — [source](https://leg.mt.gov/bills/2021/SB0399//SB0328_2.pdf)
3. **SB0328_X.pdf** (committee substitute) — [source](https://leg.mt.gov/bills/2021/SB0399//SB0328_X.pdf)
4. **Enrolled** (enrolled) — [source](https://leg.mt.gov/bills/2021/billpdf/SB0328.pdf)

## Votes

- Do Concur — **98–0** (pass) · lower
- DO PASS — **10–2** (pass) · upper
- Do Concur — **50–0** (pass) · upper
- Do Pass — **34–15** (pass) · upper
- Do Concur — **46–4** (pass) · upper
- BE CONCURRED IN AS AMENDED — **12–3** (pass) · lower
- Do Concur — **100–0** (pass) · lower
- Do Pass — **37–13** (pass) · upper

## Sponsors

- Duane Ankney — primary (person)

## Timeline

The legislative action history — every referral, reading, and vote.

- **2020-12-10** Draft Request Received
- **2021-01-22** Draft On Hold
- **2021-02-13** Draft to Requester for Review
- **2021-02-15** Draft to Requester for Review
- **2021-02-16** Draft in Legal Review
- **2021-02-16** Draft in Edit
- **2021-02-18** Draft to Drafter - Edit Review
- **2021-02-18** Draft in Input/Proofing
- **2021-02-19** Draft in Final Drafter Review
- **2021-02-19** Bill Draft Text Available Electronically
- **2021-02-19** Draft in Assembly
- **2021-02-20** Draft Ready for Delivery
- **2021-02-20** Executive Director Final Review
- **2021-02-22** Draft Ready for Delivery
- **2021-02-22** Draft Delivered to Requester
- **2021-02-22** Introduced `introduction`
- **2021-02-22** Fiscal Note Requested
- **2021-02-22** Introduced Bill Text Available Electronically
- **2021-02-22** First Reading `reading-1`
- **2021-02-22** Referred to Committee - (S) Natural Resources `referral-committee`
- **2021-02-26** Hearing - (S) Natural Resources
- **2021-02-26** Committee Executive Action--Bill Passed - (S) Natural Resources `committee-passage`
- **2021-02-26** Sponsor List Modified
- **2021-02-26** Fiscal Note Received
- **2021-02-27** Fiscal Note Printed
- **2021-02-27** Committee Report--Bill Passed - (S) Natural Resources `committee-passage`
- **2021-03-01** Scheduled for 2nd Reading
- **2021-03-01** 2nd Reading Passed `reading-2`
- **2021-03-01** Scheduled for 3rd Reading
- **2021-03-02** 3rd Reading Passed `passage, reading-3`
- **2021-03-02** Transmitted to House
- **2021-03-08** Referred to Committee - (H) Natural Resources `referral-committee`
- **2021-03-08** First Reading `reading-1`
- **2021-03-17** Hearing - (H) Natural Resources
- **2021-03-26** Amendments Available
- **2021-03-29** Committee Executive Action--Bill Concurred as Amended - (H) Natural Resources
- **2021-03-31** Committee Report--Bill Concurred as Amended - (H) Natural Resources
- **2021-03-31** Printed - New Version Available
- **2021-04-12** Scheduled for 2nd Reading
- **2021-04-12** 2nd Reading Concurred `reading-2`
- **2021-04-13** Scheduled for 3rd Reading
- **2021-04-13** 3rd Reading Concurred `passage, reading-3`
- **2021-04-13** Returned to Senate with Amendments
- **2021-04-15** Scheduled for 2nd Reading
- **2021-04-15** 2nd Reading House Amendments Concurred `amendment-amendment, amendment-passage, reading-2`
- **2021-04-15** 3rd Reading Passed as Amended by House `passage, reading-3`
- **2021-04-15** Sent to Enrolling
- **2021-04-21** Returned from Enrolling
- **2021-04-21** Printed - Enrolled Version Available
- **2021-04-23** Signed by President
- **2021-04-23** Signed by Speaker
- **2021-04-23** Transmitted to Governor `executive-receipt`
- **2021-04-30** Signed by Governor `executive-signature`
- **2021-04-30** Chapter Number Assigned `became-law`

## Source

OpenStates / OpenCivicData bulk snapshot [2026-07-01](https://data.openstates.org/daily/2026-07-01/public.pgdump); origin `ocd-bill/435314f3-7686-4c96-a73e-d3885b6d43e4`. Confidence: reported (aggregated from official Montana legislature records).