Exhibit (c)(3) June 21, 2024 Project Augusta Discussion Materials for the Conflicts Committee Strictly Confidential. Not for Distribution.

Preliminary Estimated Timeline and Next Steps ➢ May 24: initial kick-off meeting post receipt of Offer among HL, MH and Conflicts Committee ➢ May 24: HL and MH information request lists sent ➢ June 4: majority of HL information requests received ➢ June 5: all-hands kick-off presentation to HL, MH and Conflicts Committee ❑ Business overview and recent updates ❑ Overview of financial projections and key assumptions ❑ Discussions around potential transaction rationale ➢ June 7: ❑ Check-in meeting among HL, MH and Conflicts Committee ❑ Follow up “model diligence” discussion with HL and management ➢ Week of June 10: ❑ Continued due diligence and review of information and financial projections received ❑ HL develops financial analysis framework ➢ June 14: ❑ Check-in meeting among HL, MH and Conflicts Committee ❑ Follow-up business and general due diligence call was held with Company management ➢ Week of June 17: ❑ Continued due diligence and review of information and financial projections received ❑ On June 18, 2024, a revised model was received which incorporates the reduced labor costs associated with the Brent Hamilton’s retirement in 2027 • 2027E and 2028E Adjusted EBITDA increased by $0.8 mm (0.7%) and $1.6 mm (1.3%), respectively, compared to the model dated May 30, 2024 ❑ HL performing financial analysis 2

Preliminary Estimated Timeline and Next Steps (cont.) ➢ June 21: check-in meeting among HL, MH and Conflicts Committee ➢ July 1: Date for HL presentation of preliminary financial analysis to Conflicts Committee ❑ Discussion among HL, MH and Conflicts Committee around potential response ➢ Weekly check-in meetings among HL, MH and Conflicts Committee scheduled 3

Unit Performance Since the Offer As of June 20, 2024, the unit price for the Company reflected a premium of 8.2% relative to the Offer price of $3.05 per unit. Closing Price and Daily Volume Since Offer Closing Unit Price ($) Daily Volume (millions) Unaffected Price [3]: $3.00 Current Unit Price [1]: $3.30 Offer Price [2]: $3.05 $3.50 2.0 $3.25 1.5 $3.00 1.0 $2.75 0.5 $2.50 0.0 5/24/24 5/26/24 5/28/24 5/30/24 6/1/24 6/3/24 6/5/24 6/7/24 6/9/24 6/11/24 6/13/24 6/15/24 6/17/24 6/19/24 Daily Trading Volume Company Current Unit Price [1] Offer Price [2] Unaffected Price [3] Trading Volume The Company’s average daily trading volume has increased ~84% since the announcement of the Offer relative to trading volume observed in the 1-month prior period, but remains low. 1-Month Before Offer Since Offer Average Daily Volume: 0.06 million Average Daily Volume: 0.10 million 1 1 VWAP : $2.89 VWAP : $3.20 50.6% 48.1% 37.1% 25.4% 13.8% 10.5% 7.4% 5.3% 1.8% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% $2.60- $2.70- $2.80- $2.90- $3.00- $3.10- $3.20- $3.30- $2.60- $2.70- $2.80- $2.90- $3.00- $3.10- $3.20- $3.30- $2.70 $2.80 $2.90 $3.00 $3.10 $3.20 $3.30 $3.40 $2.70 $2.80 $2.90 $3.00 $3.10 $3.20 $3.30 $3.40 Note: On 5/24/24 the Company received a non-binding proposal from Martin Resource Management Corporation (“MRMC”) pursuant to which MRMC would acquire all of the outstanding Common Units of the Company not already owned by MRMC or its subsidiaries for a cash purchase price of $3.05 per Common Unit (the Offer ). 1. As of 6/20/24 close. 2. Per the Offer. 3. Represents closing unit price on 5/23/24, the last full day of trading prior to the announcement of the Offer. Source: Capital IQ, Bloomberg and Company press releases. 4

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